This is very foreign to my way of thinking.

I commission artists somewhat regularly, and if I had to name the top two reasons, they would be 1) I really like their style, and want a piece in that style 2) I want to support them so they can continue making the art I like.

Meeting my checklist of inclusions is important, but definitely secondary to the reasons above. (And sometimes the deviations are reflections of the artist's particular style and therefore welcome.)