I'm someone who prefers a more "old school" racing flat/tempo shoe (Nothing against modern supershoes, just haven't found a pair that works for me yet) so I'll occasionally grab 2-3 pairs of a favourite model when they go on clearance. Since they're relatively unfashionable given current shoe trends I can usually find them pretty cheap, and more often than not the newer iterations are moving away from what I like.

Track spikes are exclusively bought when all the rich kids start springing for the latest and greatest at the beginning of the season, and I can bargain bin last years model for $20.