If you are to be a professional gambler, these are the things you will take into consideration when working out your potential to make money:
1. The payback percentage of the game you're playing
2. Cashback for your play or points for free play
3. Comps and gifts
Take video poker for example. Yes, believe it or not, there are professional video poker players out there. If done properly, it's actually the only game in Vegas where you can get a mathematical edge over the casino. Pro VP players are rare and the
casinos that offer VP machines that could possibly favor the player are also rare.
The first thing to consider is the payback percentage of the machine. A typical VP machine is going to have a payback percentage somewhere between 88% and 95% assuming you play the game perfectly. Over a long period (Days, months, years..), 95% is going to crush you; however, some machines offer a progressive Royal Flush jackpot. When the RF jackpot gets high enough, that 95% payback can get to 97% and higher before the jackpot hits. Sometimes it gets high enough to put you over 100% but not often because of all the players who hammer the machine (Or bank of machines) when it gets that high.
Now, if the casino is offering a players card with cash back for your play, you have to add that into your payback percentage....which can put you over 98% especially if the casino is offering a multiplier on that day. 98%+ is high enough for a pro because it stands to reason that when he hits the RF (And he eventually will) there's going to be some profit there.
If the casino is offering any other comps (Food, gifts, etc...), this also increases the payback because those things do have value.
Several of the casinos got rid of cash back many years ago simply because people were figuring out ways to shave down the casinos edge. Instead, they offer points that can be used for free play which is not as good as cash back but does have some value. There's a few casinos left that do offer cash back; however, not all of them offer VP machines with progressive jackpots and decent pay structures that could give you an edge.
Even if you're not playing on the machines, you can still use your players card on the tables and in the poker room for points or cash back. There's also the comps. It all adds up.
So yeah, bonuses and tickets do have value and are a part of your profit.