Me
If the concern was if Joost could do it for $300, that Hot Toys Catwoman shows it can be done since Joost said he's aiming for at least Hot Toys quality. Problem with that Cat-haway is all artistic choices rather than price or quality.
Another comparison to Hot Toys price is the recent Dark Knight 2.0 Armory set, you get a Batman figure, Bruce Wayne figure, and the Armory + accessories all for only $565. Jazzinc Catwoman with just the Normal Catwoman + Battle Damage Catwoman would already be $600 for just the basic figures (this is if there's only 500-1000 preorders) without factoring in whatever discount price Joost mentioned. If the Jazzinc pre-orders go well over 1000, he said he will add in multiple swap-out headsculpts, the unmasked sculpt, and accessories like bird cage. He also mentioned the single Deluxe version of Catwoman that comes with the Hell Here apartment diorama is more expensive than $300.