I'm also a gardener, and I see it with Home Depot, for example, which stocks plants that are inappropriate for a region… yet they shamelessly sell these guaranteed-to-die plants to unwitting customers.
Agree 100% — I think for Sulcatas the size is the issue. People have no clue how big those cute little hatchlings will grow – the lack of knowledge always astonishes me. It just points back to irresponsibility on the part of whoever's selling.