I think you don’t think this through. The main barrier here is the up to 10 levels, but the rest could be done.
One stocks run gives me 4.7k xp. Just for completion. That’s ~50k/h with monster and boss xp (more than that but ok), not counting DMF.
My level 95 alt needs ~640k to level up. That’s 13 hours with this method. Which gives us around a thousand and three hundred hours (very very tough estimate, a lot less per level until 95 and more per level over 95) from 20 to 120.
Still won’t happen because of the 10 levels thing. But it’s a very clever idea, certainly not „retarded”.