You may also want to make a better looking logo and ui before offering that 20btc jackpot.
Does it really matter? As long as people can get their 20 btc jackpot, i think there will be many people will play on his site though, although they dont have good ui and better logo. But all of that can be slowly change though. They really need a lot of attention for this kind of game, that is why he offer something good like 20 btc jackpot to attract more people. But they really need to change their domain too before they really publish it because .com is always better than other domain
First impression is always come from what we see, so good UI is always a matter for gamblers. Even if the site offers so huge jackpot but they have terrible UI then players will think twice to play on the site. Jackpot is indeed a great way to attract players but not all players are interested to play only for jackpot. Jackpot is something that hard to get, real players will only focus on how to get some profit on their betting instead of focusing to hit jackpot.