I practice about 4-5 times a day indoors. Plus a few league games every week. I can usually manage with 2 pairs per season. This season I've used only one pair of Hyperdunk 2012 and they are slowly showing signs of breaking down.
Its good to have two pairs of kicks if you have to wear them twice a day, for example practice in the morning and game in the evening.
a good pair of indoors will last me about 2 years playing 5x a week. i dont even let them touch the ground anywhere but on the hardcourt. after they start losing their structural integrity they become my outdoor ball shoes and i buy a new pair. been rotating like that since 9th grade.