The problem is that it becomes a mana sink that you can only use on your own turn, rather than a way to invest leftover mana at the end of an opponent's or immediately after they drop a board wipe
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P/T Number 0 Language English Legal Formats Commander, Legacy, Modern, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Pioneer, Standard, Timeless Rulings (10/4/2004) The ability destroys the creature at the end of the combat, which is after all first strike and normal damage dealing is done
They will just drip into the pop over years which will not really affect price