The thing is, though, when a player clears waivers for MLB after the trade deadline, you're able to trade him freely for whatever you want.
If your scraps clear waivers if the waiver price was fixed as a 4th rounder, for instance, then you can trade that player to whomever you want for something that's more reasonable after that player clears. It also makes it a little easier to do player for player swaps when other players clear waivers.
It's just a thought anyway. Fixing the waiver price might have a few more pitfalls than I'm giving it credit for at the moment, though.