Thanks for the reply, I like it when my input is apreciated.

About my point 1, there's obviously nothing to say against anti bot measures, but where they lead to losing real customers it really is counter productive.
Not sure whether or not you know, but captchas increase in difficulty for two reasons.
1) The frequency how often a given IP accesses a captcha.
2) Time of the day and day of the week, meaning the amount of overall traffic on the web.

This logically means, someone like me, going through 25+ captcha protected sites every 15 minutes will during daytime get to the hardest captchas within an hour or so.
Especially SolveMedia will come up with scribbles that are entirely unsolvable even for me with my experience, meaning at this time of the day, your site will deal almost exclusively with robots, because if I cannot solve the captchas, I assume nobody (except of robots with the help of Chinese professionals) can.

If you want a suggestion for a captcha that remains solvable, try what most other sites do by now: Offer a set of different captchas where users can choose which one they prefer. My favorite one is called "Geetest", because it's fast and doesn't increase difficulty.
It won't protect you from robots, but at least it won't prevent regular users from coming to your site.

Edit, one more thought: The BY FAR most effective protection is NOT using a wide spread protection that's in use by a gazillion other sites as well.
I run my own website, I don't have ANY anti bot protection on it, but I've never had a bot signing up.
Why not?
Because I've written the signup form myself and I've given the input fields for username, mail, etc. wild names that a robot doesn't even detect this page as a signup form.
I've seen the simplest protections, like "whats 2+2?" where no robot ever solved it, simply because the site itself holds the entire protection, without rerouting to a captcha service that is in such widespread use that hackers found it worth their time writing a crack for that protection.
Nobody writes a crack for a unique protection used exclusively by one single website in the world.

While I have nothing better to do and since you asked for it, here's a small list of suggestions, of what you could improve on your site.

1) Captchas do NOT protect against robots, just the opposite, they prevent regular users from using the site.
I'm not an expert in these things, but as far as I know, there are now Chinese workers, earning pennies an hour, solving captchas for a job.
This is where robots get their captchas solved and this is also why the captchas cannot tell robots from humans anymore.
Since these professional captcha solvers are WAY better in solving even the hardest captchas than any regular user will ever be, a captcha protected site will end up with 99% robots, simply because regular users aren't able to solve the captchas anymore.
I strongly suggest you find a better way of protecting yourself against robots, because using something counter productive, only because you have nothing better, gets you nowhere.

2) There are quite a few sites where faucet users can accumulate Satoshis of several crypto coins, like Faucethub, but there's one I HIGHLY prefer, which you do not have as a withdrawal option.
coinpot.co allows on site conversion of any coin into any other coin without any minimum, meaning I can collect there 5 different types of coins, convert them all into my favorite coin and cash them out without needing 5 separate wallets.
If possible I'd love if you could add coinpot as a withdrawal option.

3) There are a few ads that lock up the browser, not sure how to describe that.
Most times it's a voice with a strong eastern accent asking the user to click an OK button which will install some toolbar or a flash player or something, which appears entirely independent from whether or not the user has already installed that, where a click on "cancel" makes the button reappear faster than one can close the ad.
The only way I found so far, of how one can terminate that ad is closing the browser through the task manager, which closes ALL open browser windows.
Since I always have 20 or so browser windows open that's such a pain reopening them all, that I tend to avoid sites that have these ads, no matter how useful their other content may be.
I would appreciate if you could pay attention to what ads you accept and leave these out.

4) I'd apreciate a button "account" or something similar on your site, where one can see how many people have signed up through my referral link and how many Satoshis I got from that.

I have an account at Faucethub, but as I said, it's not that urgent.
Believe it or not, I'm already glad I found this direct contact here, where I can get a reply, which is already more than ANY other faucet provides.

The payout is not that urgent, as long as I can get it some time.
If you can fix this and I can withdraw the regular way afterwards, I would prefer that, because then I would know it will work next time.
Either way, I've provided my addy in the mail to support.

How about answering e-mails?
How about fixing the website?

I have 2500+ Satoshis accumulated and when I click "withdraw", I get a huge, blank, red field laid over the site, where I can guess, red indicates error, but since there isn't anything written in that field, how am I supposed to know whats going on?
I have e-mailed you about this 2 days ago, got no reply.