^^ I think your absolute "only" threw me off. Opponents pre/post-flop tendencies should easily be the biggest factor.

I think there is a confusion about the "stealing" part. OP is talking about raising a playable hand with the added bonus of potentially of stealing the limpers blinds. I "never" raise limpers with complete garbage and I've been running 25%pfr (only moderately profitably, but that's a different topic) since the new year. So my cards affect the size of my raise by a bb or 2 because some hands play better post-flop, sometimes I want/don't mind a call. At 50NL me raising in this situation is almost always for value/isolation.