Don't fool yourself, they aren't setting an MSRP (note: not "the" MSRP) because they are constantly changing the targeted value of the device.
GPD Win backer price: $300.
GPD Win MSRP on Indiegogo: $500.
GPD Win Japanese backer price: $280.
GPD Win on Geekbuying: $330 with a guaranteed "discount" of $50.
So, yeah. They are constantly changing the targeted price and not setting an MSRP, at least not one that's visible for consumers.
Also, "backing" GPD is a backwards concept seeing as GPD is a large company, and not a small team. Do not fool yourself, you've preordered an overpriced device you from the manufacturer via a crowdfunding site.
I don't mean to sound negative, but I've said most of it from the start. Seeing people vehemently defend bad business practices because of a cool product (which I admit, for all of its possible flaws - it is cool and enticing) just makes me sad, and if I can change it by making people more critical I will.