they are pretty decent. you need 1 or 2 resist peices when making a suit, whats hard is to get the lmc, lrc, and ohter useful mod as well as the resists you need.
your non lmc piece is usually where you cram in other stats like damage eater, cf, hpr etc, but for a low end suit could also be where resists are fit in.
this is very generalized tho, of course every suit is different.
ones with no lmc 500k-3mil
ones with lmc 5-20mil
if someone needs a piece to complete a suit of course he may pay a premium, lower end stuff people might buy just to have around to fit into a future suit.