@ All

Well, actually it "IS" a very good idea to add the Blend files. ( or sourse files, but Blender becoming more and more polpular, why not)

Usually, end users are looking for some item, and they find, well, "about" what they need but not "quite exactly".

When builders would provide the sourse file also, it would make it a LOT simpler for buyers/end users to adapt the product to their exact needs.
Actually, providing the sourse files could enhance sales by quite a margin.

I like the idea, and for my next items, I"ll surely add the Blend files also.

Certainly for props
For clothing or figures that require rigging, conventional or Weightmapped, it is not so simple, but certainly an option.

I like it.

I won't add blend files because I'm not a teacher and I'm not trying to teach anyone anything. I'm still learning myself, so the best anyone can learn from me is what NOT to do, or how to make your work flow harder than it needs to be. We don't need anyone learning or spreading bad habits.