Their appraisal tool is there to help them make sales because that's the only way a brokerage makes money.
So on the low end, they want to convince buyers that any crappy domain is worth at least a couple $K or more. Obviously the low end sales like that is where all the liquidity is because literally anyone can afford it. That has to be their bread and butter commissions.
On the high end, they know only one a tiny fraction of the inquiries are going to be willing and able to afford it. The lower they push those high end valuations down, the more likely they make a sale and thus a commission.
So although the appraisal tool helps Godaddy across the board, it helps a seller on the low end and hurts a seller on the high end.