I don't think that would be usefull, if the enhancement sells all the blocks in your inventory that you mined with it.
If you're invertory is full and some blocks don't get picked up, then you sell the blocks you mined and pick up the extra blocks, those blocks won't be considered part of the enhancement.
Lets say you mined something that you need like redstone and emeralds for machines and trading, you look for them then they get sold. I know you can just use a different pickaxe but then having to switch between pickaxes slows down fast mining session.
Selling it manually is better, you get to decide how much you want to sell and easily sell your whole invertory.
I don't see a point, if you want to get money make an automatic sugar cane farm.