People should be checking tire pressures regularly regardless. Anyway, the TPMS sensors have an internal battery that generally lasts ~8 years. So... $200 over 8 years isn't so bad.
The good thing is that you don't HAVE to put them on. You'll just have to get used to the annoying warning light that glares at you while you drive. But since your car's already set up with a system, you might as well use it.
