Yes, I would. In an ideal world, a PDF has no fancy backgrounds, very modest headers, and grayscale illos. :-)
The problem is probably that PDFs are used in two different ways, some prefer to print them, or at least bits of them while others only read them on screen. The latter group may prefer all the fancy stuff which makes them near impossible to print.
Normally? Curse them. I don't buy all that much rpg stuff to begin with, I don't have a group to play with, but I've picked up some PDFs.
I've reluctantly printed some of the MRQ ones, but the BRP monographs are generally excellent for printing. Black text on white background. Printer, and wallet, heaven!
PDFs that are too graphics intensive for printing I simply won't buy unless there is some very compelling reason. I hate reading long texts on-screen. This may change in future though, as I'm getting interested in getting an e-reader. But, if I understand things correctly, those aren't generally happy with too heavy graphics either.
I think there was a thread on this very topic only a few days ago on rpg.net.