I'm sure you're right.
Unfortunately, they are in that middle ground. They're not really "character figures", they're just "extras", and while I'll certainly (happily) pay more for individual miniatures if I like the look of them, I have repeatedly looked at this range and thought "not quite worth it".
Individual figures I would buy, but Foundry only sell them in packs, and there'd be too many figures in any given pack that I know I'd never use.
I understand the economics of it from the manufacturers point of view, but, I want to be able to happily use all the figures from a pack I'm buying, and as far as this range is concerned, I don't think I generally would.
This isn't just restricted to Tim Prow's stuff, or even just Foundry, it's something I take into consideration whenever I contemplate buying a pack of miniatures. If I know I wont use at least the majority of the figures in a pack I'll pass.