ok here goes off the top of my head:
2 pair flat black pumps for work
1 pair low heeled dress shoes for work (which shoes depend on which trousers I'm wearing of course)
2 pairs of trainers (one manky old pair for scuffing about in)
1 pair black stilettoes
1 pair lilac silk heels (bought for a wedding)
3 pairs of heeled black ankle boots (dunno why 3 but I wanted them 
)
1 pair walking boots (from my falconry days)
1 pair black sandals
1 pair tan stilettoes (cos they look great with jeans)
1 pair knee high black boots
1 pair knee high brown boots (identical to above cos they comfy)
so I guess that makes 15 
plus anything I missed out. Is that excessive?
Edit: I forgot to add my Indian khussas which are grey with black beads hand sewn on them......severely impractical but very comfy and they look great !
