I only play dice and Roulette games and I have owned accounts in couple of sites. After being active a couple of years, my understanding is that even a 1% profit setting holds no guarantee for any player and the longer a player pushes a particular strategy, the more likely the system catches up with the next move. My suggestion is to always set out with a bunch of tested and working strategies and then to always have them randomized.
I am not even sure of any strategy that anyone wants to play that the system will never catch or that has not been fashioned for the system to detect anyway as that is how I have always seen it. However we want to randomize strategies and no matter the game we play, as long as the system has picked you to suffer a huge loss, there is nothing any strategy can do about it. I am talking from experience.
5% a day isn't so bad at all, it's a good strategy if you are gambling everyday and whole day long. But to consider 5% as enough profit you need to have big bankroll so that you can see to it that 5% would be enough for you. You need to have at least 0.05 BTC to have a good return with 5% everyday.
I would rather consider trading and getting those 5% a day which is very possible if you know what you are doing than gambling and expecting 5% a day. Do not get me wrong, I am not against gambling but I am against expecting too much from gambling. 5% as far as I am concerned is too much to even expect. You will be lucky if you even get up to that and if you do not end up getting those 5% losses over and over again.