I think that it depends on the time the casino has been established in business, where it's located and how much it values reputation.
 I have gotten bonuses, comped rooms, free show tickets, free buffets and thousands of dollars in play credits.

From my favorite two online casinos they have always honored deposit bonuses and all of it's promos. One has better video poker odds than most casinos and they have always paid out fairly, no matter how big the win. It's amazing really.

I recommend signing up for all membership programs at every casino that you frequent and taking advantage of all advertised bonuses and free plays if you are playing during those time periods.

In Vegas on Fremont, a free steak dinner for an hour of game play can be enough of a bonus to play a few hands and leave a little up or at break even. This giveaways are included in the budget and just go to waste if you don't take advantage of them.