With Develop, Upgrade, and Remake, the effect is the same as other 7-costs. The problem with a 7-cost victory is that it's practically competing with provinces. I bet it would be really really hard to design a card that can fill that slot.
As for a 1-cost, vanilla 1 VP already costs 2. You want a victory card with a drawback? Or that DA card, overgrown estate, which is actually worth 0.