I just had a look at the website http://extentad.com/

How long does the viewing of advert last, does is require captcha, to move on to the next, how many ads can be viewed in a day, is there a limit.

Do I have to buy in?

Edit:

I noticed whilst there that malicious adverts pop ups are on, three in the last few minutes.
Saved by my AV, so after writing this don't bother with a reply, when trying to use the tabs on the site more and more pop ups appear, so it not for me.
This website may pay, but not worth it, as computer would probably get infected.

Not willing to take the risk, oh no.