It is really difficult to compare staff pay with travel pay and it often depends on where you are staff for whether you can really make a financial case for it. In terms of total compensation per hour, most contract pay between $40 and $50 an hour which is 80 to 100K per year for minimum weekly hours. But this doesn't tell the whole story as it doesn't include tax benefits which can increase your bankable pay substantially beyond staff pay of a similar gross amount. However, the benefits of being staff with good insurance, vacations, holiday pay, education and sick pay does add 20 to 30 percent to staff pay (at least from HR's perspective). If you are in fact making between $40 and $50 an hour as staff, then you may have a difficult time doing the math on paper. For nurses from the south (where most travelers come from), it is easy.
Some travelers working rapid response jobs working 48 hours plus can actually make over $200,000 a year, but this is far from the norm and usually requires a lot of hard work at crappy hospitals. I think of most travelers working normal contracts and not taking time between assignments as making on average 80 to 100K gross, but more take home with tax benefits. Some new travelers do much worse as they spend as if they are on vacation. To do better in savings, you have to be disciplined, especially with housing. Lots of no cost or low cost ways to enjoy new locations. I do a lot of exploring by bicycle myself.
Things are really different going from staff to travel. For myself, I went from 3 years as staff in Baltimore to travel and there was no comparison. In 3 years, I just saved enough to buy a good used car ($2,000 in 1995) and started traveling broke. And I am super thrifty but housing ate up too much. My first several assignments paid within a couple dollars an hour of my staff job, but with housing and per diem I started saving 80 percent of what I made. Some 18 years later, I've paid for a house cash and have enough banked to retire modestly.
There are tons of individual variables, specialty, ability to adapt, people skills, family, health, and desire. The last is the most important. Basically if you do anything just for the money, you are not going to be happy. If you have wanderlust, or truly want to improve or maintain professionally and not get in a rut, these are the best reasons to travel. Don't do it for the money, if you have a good staff job with a decent pay to housing cost, you may well do better financially to stay put.
Too much thought about number crunching and you will never do it. You will have to try it to see if it works for you personally, professionally, and financially.