I use stands for a couple of Sideshow figures that simply can't stand on their own and currently for Selina Kyle from Hot Toys - none of these can stand on their own for very long - though I did have Kyle up on those heals for over a month before she fell over. In any case, falling means down onto the shelf they're standing on, not off the a shelf onto the floor - that's what glass panels/doors are for.
I'll be replacing the ugly stand on Kyle with a hidden arm that bolts directly to the shelf and everything else stands fine without stands - even my hasbro stuff has been standing for 1.5 years or so (again, behind glass).
IMO, if a company produces a figure that can't stand on its own, they've failed miserably.