This was a thing back in V3, and people could just drain tokens off of picks to get a ton of tokens, and I think that would ruin the current economy. I don't like the idea of this coming back, even if it was only 50%, because people would just start saving up picks and then draining them for tokens, and just maxing their pick out in a day or two.
Yeah I don't really see this being beneficial. I remember when you were able to remove enchants off of pickaxes and players would just sit at warp enchant with vaults full of pickaxes. Even though you only got like 1-4 tokens (from what I can remember) per level that you removed, if you have a bunch of pickaxes then you still get a lot of tokens which would kill the economy. If there was some way of making this less OP then it wouldn't be a bad idea, but I'm not really sure how you would do that.