I don't think its unreasonable for a well fitting bra that lasts a long time - I rotate through the 4 I bought originally and they have to be 8 yrs old by now. YMMV
True, I've never had a bra last more than a year before I tossed it. I also never bought a sports bra over 40 bucks.
Funny, I'll spend 60-70 bucks on Victoria Secret underwear, but I never invest the same into my sports bra. Funny how people are, me included, they never invest in the things that are good for them per-say.