This is why I love my sub-$100 Jos. A. Bank suits - I don't need to stress about how long they'll last. OK, for a particularly nice one I'll go up to $120 or even $150.
Seriously - If I'd be paying more I'd have to start making calculations of quality, durability, is it worth paying even more for better quality, etc. At this price point, I can feel comfortable getting it for however long it lasts.