Hmm. I'm just gonna share something, I also tried those 'Deposit Bonus' of some site, and well, I found that, yes you can play longer because of the bonus, but to actually be able to withdraw it? They put a lottttttttt of rollover requirements that it's just so sad. 
So, anyway I just now look at the HE offered and choose based on that, as well as the events held by the site, I find that it offers more chances for me to actually win some. Still, goodluck to you. (maybe you could get over the rollover) 
Well, if they are going to let people withdraw the deposit bonus easily, then people would just repeat the whole thing over and over until the website has no more money. They will just sign up repeatedly to get the deposit bonus. Deposit bonus are made to make you last in the casino a little longer. So you could get the feel of the whole game, not to be spammed by users. So, anyway I just now look at the HE offered and choose based on that, as well as the events held by the site, I find that it offers more chances for me to actually win some. Still, goodluck to you. (maybe you could get over the rollover)