We'll see, but they specifically said the crowdfunding rewards would not be sold at the event. They'll have other goods available there. As for the pin badge set, yes the higher tiers got them as well, but that aside I wouldn't feel bad if I were you. The reason so few people went for it is that it just doesn't look that good. In fact I suspect that a few of those who backed that tier only did so because they figured they could resell it as a "rare item" a year from now.
Like I said when the campaign started, the best tiers outside of Miura's autograph were clearly the ¥18,000 and ¥35,000 ones, which is why most people went for them.