The biggest problem with that is a respec essentially allows your character to do it all. There's no differentiation of builds if you can just be whatever build you like. Time to craft? Respec and craft amazing stuff, then drop that Int and all those skill points and put them back into Agi and Dodge/Evasion so nobody can touch you when you fight. Beast fight up ahead and you're melee? Respec into Psi and traps and never even let the waves of bladelings get close.
A one-time respec about the time you return the drill and open up the world? That could probably be argued as a good idea, since new players seem to often comment that they don't understand or appreciate, during initial character creation, how important it is to keep a focused build. But selling respecs? I don't think you'll find a lot of support for that idea here, from forum users or even from the devs. Part of the design philosophy is that UnderRail should be a slightly different game for different character builds, and to be honest, I think a lot of us really like that.
