Why?
I'm trying to find a better way to put this, but the best I can come up with is I'm looking to buy the miniature, not the paint job.
Don't get me wrong, I love seeing a well painted mini. Every day I check out new posts in the minis section of the forums and I check CSO for updates several times through out the week, but when I'm shopping IWM, I much prefer to see just the model itself. After all, that's what I'm shopping for. I don't mind the black wash because that helps show off the model's details that might otherwise get lost in a smaller photo.
Paint doesn't bother me so much on larger scale plastic kits, but for small metal minis I find the bare metal just sells the mini to me better(when shopping).