To be fair, the Fourth Doctor came out pre-covid (which, like it or not, has made everything more expensive), and the signature edition for Tom is 20% bigger at 500 pieces as opposed to 400 for this one (and already sold out), so they can spread the costs out more.
Cheaper would be nice, but given those factors, and the complexity of this piece with the outfit, I'm okay with it personally (as long as it turns out well).
I don't mind paying a little bit more either...it's a pretty intricate costume to pull off and if the production piece is close to this superb looking proto i'll be happy
A full set of classic Doctors is getting ever so close with only Troughton,Davison and McCoy left to add...Oh and a Cushing movie version would be nice too