I think collector perception (and maybe that of some of the general parent factor) was a bit skewed with PCC: We're used to everything transforming into something else. If a drill-tank is there, it's an actual Transformer.

I think that if they'd have been actual Transformers, even the simplest conversion of standing them upright, we'd have viewed a 5-pack as containing 5 figures.

As it was, I think a lot of people viewed it as 1 figure and 4 accessories.

Thus making it less desirable and of less value to a buyer.

It became one overpriced scout, instead of one combiner.