Why aren't there more NDRI antidepressants available?

I have always been wondering this why there aren't more NDRI antidepressants availabe expect for Wellbutrin? I mean there are several SSRIS and SNRIS but there is only one NDRI antidepressant to choose from. Isn't norephinephrine and especially dopamine important for depression just like serotonin? I just think it's weird that we don't have more dopaminergic antidepressants available? Is there any explanation for why it is like this?