That's basically my attitude.(And I also have a fair bit of reimbursed spend.) You can also get credits that are effectively cash (e.g. on Amazon) or even actually cash. They're usually theoretically worth less than the airline miles or hotel points but are a lot easier to use efficiently.

As another comment suggested, there are also a lot of games that you can play churning credit cards--as well as playing gift card games. My personal take on those though is that you really have to keep on top of introductory offers, using gift cards, etc. or you can easily end up in the hole. It's also essentially a hobby. Once it becomes work, it's probably not worth it.