Exactly. I prefer the regular crowdfunding version, because then if they reach it it is at least more likely to be completed the way it was planned out. If they don't reach it, they have to either give up or rework the idea so that they can lower the funding or get more pledges second time around. Flexible funding in general comes across as more of a "give us some money and we'll see what we can do with it" kind of scenario.
Actually, when I think of it, it really comes across as IGG thinks the backer cares more about the rewards than about the goals - more about the toy surprise, less about the box of cereal it's in. But many projects, not the least of which a playing card project, could never genuinely use flex funding properly - you either raise the money to pay for printing, postage and packaging or you don't, cut and dried. It's a fixed, mandatory amount, which no amount of fudging can change, short of decreasing the print order (which increases the per-deck costs, cutting into what little profit one might have had). I suppose one could try making a documentary on less than a shoestring budget, but the thinner the string, the more likely it will break.