But they do

I just don't make a big deal about it.
http://www.jacksonguitars.com/artists/index.php?id=437
If I were to use other guitars I would go on merit on a per instrument basis - meaning listen to the tone of the instrument and make sure the quality of craftsmanship is on par with a professional instruments.
There are some local luthiers that make excellent instruments as well.
-b
PS I probably wouldn't play an Ibanez