Maybe, maybe not. It's a combination of edition size and desirability. Padme was only 1000 pieces and the fanboys went nutty because as silly as it sounds to say it, the maquette was hot. Mace is definitely not going to have the latter quality going for it and there didn't seem to be the same general love of Mace's character in Clone Wars or the movies. Padme snowbunny? No brainer. Perpetually crusty Mace Windu? Not so much.
A limited edition size is the key, but even at 1000 pieces I'd be surprised to see his value top $300. Ever.