I have one pair of stilletoes which I’ve never worn. (And I didn’t pay $400 for them!) I just like having them available if/when I ever decide to take them out on their “maiden voyage”.
I have one pair of 4-inch heels, which I bought with the tags still on them for $1.50 at the local Salvation Army. Although, to be honest, I couldn’t see myself wearing them much of anywhere... I have some black flip-flops with fancy bead stuff on them that work fine with formal wear.