Giving tips will always depend on their service and the profit that you have made, though sometimes Im not giving any tips even if I won simply because they didnt do anything to help me at all so I dont think they deserve to get it, if they are very helpful with you then this is the only time I will give a tip. This is not a requirement though, giving tip should always came from your own willingness and not just because someone forced you to do so.
Yeah, it will depend on how much you've made and as well as if you're satisfied with how they've accepted you and serviced you.
I also don't give tips even if I win and when I think that I've got not that much. We think that before giving a tip, it should be worth it and there must be something that they've done to us for us to feel that they really have to be tipped. And not to think about that much because even if we give tips, they're not a lot.
^ It is a tradition to give tips and that existed a long time ago and being generous when you have won a big amount is good practice. Many people say, giving tips will make you luckier in the next game but I know that is only a superstitious belief. I always give tips win or lose to a casino dealer if I have left in my balance, we know it is their job but I think they will feel happy if they receive any amount that comes from us, it is a big deal for them. So for me, don't hesitate to give tips if you can, even though that is a small amount, they will still appreciate you in that way, trust me because I have been there already.