Ah, the usual "We'll double your coin, honestly, we wouldn't lie to you" scheme.
Since this is the gambling section I'll say that I would bet their story was something along the line of "we know about this blockchain exploit, and because we want to make them aware we decided to run this site and give back to the poor" or something of that ilk.
Keywords being "I would bet" because I actually won't because they're long gone already, and "we decided to run this site" because, well, they have run, with other peoples' BTC.
It may not happen this round or next, but it will happen
So besides being a Fascist you also have a Crystal ball to see the future? Usually people with that profile have a GOD complex.
You'll be very sad to see CryptoPot live and running in 1 year. I would bet with you but I don't like Gambling.... time will prove me right "my friend"
opmac: 1; Cryptopot: 0.
God complex: disproven; merely thrown around while (poorly) attempting to deflect the issue that was pointed out... "oh you call me a scammer, you have a god complex you fascist, yaddayadda".... it's now July, about three months after the quoted posts, and a bunch of suckers are sad to see that Cryptopot... well... ran with their coins.
That's right, the mighty and brilliant and holiest of holy, Cryptopot, has surprisingly done the (not quite) unexpected and grabbed that prizepot when they ran for the hills.
For all you folks who came here through a google search like myself, I just saved you the time of looking for yourselves if the sites (cryptopot and BTDouble) are still up.
Them's gone, going going gone.
But hey, chances are you'll be able to find them somewhere else, under a new name, with a new and (really not quite) different set-up to lure in people.
--
As for the threadstarter:
Since this is in the gambling section, here's my two bitcents:
Your best bet at growing your BTC would be to set up your own honest gambling thingy, a raffle with real prizes, which takes payment in BTC.
Make the prizes something that you can get cheaper than what people pay to gamble on your site.
About half a year ago I got my hands on a bunch of USB sticks, 8GB each, at a price that was just brilliant (thanks to a friend who was going out of business and practically gave me some of his last inventory because I paid for lunch when I was helping him clean out his old shop), which I then put up as prizes in a one-off raffle on a site of my own.
Even with me paying for the postage, I still bagged a few hundred Euro's profit in BTC.
That I invested in another raffle, this time it was a raffle with one prize... people could enter for a chance to have a coder friend of mine build them a simple webgame, a service for which I'd pay.
Unfortunately that one was a mistake on my end; too niche and too poorly advertised, too few people entering, while the advertising that did get done came with a nasty surprise charge at the end which ate up the profits from the previous raffle.
Still, my advice stands as is; if you can get something for cheap enough that enough people might be interested in, set up a raffle which takes BTC as payment, and your BTC count will have a decent chance of growing quite a bit.
Or by extension, you have just a bit of bitcoin (pun intended, unless it fails in which case I will deny everything :p), a situation in which many more find themselves.
You could set up a small-fee raffle, against a very small fee in BTC.
One person stands a chance to win, for example, 0,001BTC.... make the entry fee a fraction of that...
For example, if the "pot" is 0,001BTC for -one- lucky winner, and you get 20 people signing up with a fee of 0,0005BTC, you'll have 0,01BTC coming in against 0,001BTC going to the winner.
I'm just pulling hypothetical numbers out of my hypothetical rear end here to present an example, but the logic behind it stands.
Just be sure that you'd be honest and transparent in doing this, so you don't end up on the same lists as all those scammy scumbags.
Maybe find someone who could work as a reliable and trusted middleman/escrow person, so people would feel even more confident about it not being a scam...
You could even set it up on a forum...