I have played bingo online for many years, as does my sister, we both like completely different software that different sites use, that is one of the things that draws us to a particular site, obviously deposit bonus will draw players to the site, its keeping them there is the problem lol.... I personnally would stay with a site, due to the chat hosts, people and prize money. Dont forget about the slots as well, slot tournaments are a good idea for those of us that like that too.
Lots of cascade sites give you a 50% redeposit bonus on each deposit, where as Virtue fusion dont offer any such promotion, they do have monthly VIP promotions, which really aren't enough to compare, which is unfortunate as i am a virtue fusion girl
The one other major issue I have seen with online bingo sites are their withdrawal times, 48 hour period where you can reverse your withdrawals or part of, but even if you withdraw part of your with drawal you are bk to the beginging of the 48 hour waiting period!! There should be no such thing as a reverse withdrawal, its far to tempting to do just that and obviously that is how these sites get their money back off people.
I do think above all really look after your loyal players as they will stay loyal if you do!!
instead of trying to get new people to join with bonus etc that are only joining to claim a bonus, if you look after the loyal players they will never go anywhere else, that is for sure!
Good Luck! x