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I see, and those are both good points on each side of the argument. It would be really interesting to know whether statistics regarding this exist. How effective and sensible this is probably depends on the number of possible supporters you can gain before starting the campaign. With your case it probably makes sense to either do it the way I imagined or offer just one tier, but if you didn't get a lot of exposure initially, doing it the way dunecase does is probably beneficial as you said.