Gordon,

Just a few thoughts on the above niches.

Since all three niches are on the subject of collections of some kind, they have the same basic suspensions.

First, one could appeal the the collector's desire for RECOGNITION (rarest item, largest collection, most valuable item/collection)

Second, for beginners the NEW EXPERIENCE angle could be used as an INTERRUPTER.

Third, while I don't think there are any guarantees, the hope of a return on investment could be a MONEY GETTING suspension that one could leverage.

Anyway, thought I would chime in.

Gregg