I use both depending on the cake.
Over the years cakes boxes have improved to where I prefer them to scratch, DH of course 
I would think as long as the cake taste good that is what matters. I've never had a compliant. 
But, I do agree with charging more if you bake from scratch. It takes you more time and you only use the best ingredients. 
I just love cake, I've only ran across one I couldn't eat and that was my son's wedding. Of course the Bride thought it was the best ever, poor child. 
Be happy, eat cake 
FYI, if you're going to make boonenati's mud cakes - be aware that the temperature for all the muds should be 160 celsius or 320 F (as the temp in the recipe is incorrect).
Here's a mud thread with that info:
http://forum.cakecentral.com/cake-decorating-ftopict-60641-mud.html
HTH
I've used both and never had a complaint. Then, later, I ask people "which did u like better?", (without telling them that one was from a box) and they never know! Sometimes, I wonder if it is worth the trouble...but, I sort of feel prouder(if that's a word, lol) when I say "everything is made from scratch".
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