I have yet to see more money in my pocket. I had to take company housing, and it consumes a good portion of the pay. Gas costs and food costs aren't cheap either. I am looking at returning to a former employer, because I've made no more money at this than I did as a full-time employee. However, each traveler is different and will have a different experience. It depends on the contract, agency, and location of assignment. I can say this. On each assignment, the travel nurse is first to float (and these hospitals have no issue floating you to a floor where you're not experienced). I was floated to an oncology floor and then post-partum (I'm medical/surgical ICU). Also, as the travel nurse, you're expected to work any time they're short staffed. So plan on giving up every weekend. I've also found that we're the first to get dumped on during the night. You will also be scheduled for all the holidays.
Like I said before, it all depends on the assignment. Some people have been travelers for years and they love it.