I think that when it comes to expatriate jobs that involve a more or less equal rotational schedule (for example, 4/4, 6/6, etc.), the main benefit is the time off, and these jobs appeal to the type of person who values the time off.
I've done this type of rotational work in the past - for many years, in fact - and the principal attraction to me was the big blocks of time off. This allowed me to do all sorts of things that I could not easily do if I had a conventional 5 days on, 2 days off job.
I have no knowledge at all of what this employer (MAT) offers in terms of pay, schedules, etc.; but assuming your numbers are correct ($7,500 a month and, for example, 6/6 rotations), then I think you have to look at this not as a full time job, but as a half-time job that offers quite attractive pay for working half-time, and a whole ton of time off.
Some of us would think that is exactly what we want - others, such as yourself, might look at it and say "Uh, it doesn't give me the annual income I am seeking."