I think I "just buy stuff because its Transformers". Every year for most of my life new Transformers have come out and I enjoy seeing and trying out the new ones that look good. Sometimes they disappoint and I look to sell them on, sometimes I know at a glance they aren't going to be for me and don't buy (most Cyberverse and Earthspark toys most recently, but also Beast Hunters years ago, or Transmetal IIs decades ago). Some times the collection priorities change, I wanted a Diaclone-repaints shelf but on reappraisal of shelf space decided I don't really need it. Some of my purchases of exclusives are get it while you can and decide later. My collection goals at the moment are: the 1985 catalogue line up from WFC/Legacy/86 lines (so close); the 1984/85 Autobot Cars in Masterpiece format (also so close); and then just my favourite figures from the other lines.

Regarding No-transform / no-buy, I think I'm still scarred by buying a non-transforming Matchbox Voltron back in the 80s and being so upset it was just a statue. There are some good looking non-transforming things out there, but knowing any of those robots on my shelf can transform is what makes them special to me, and more appealing than the very few action figures (Marvel Legends).