Any issue with bring up comps when buying or selling a card?

[parkplace33]

With the National coming up in two weeks, I thought I would bring up an interesting topic (which I am sure will done at the National).

How do you feel (either when buying or selling a card) if someone brings up comps of said card? Here are two examples:

1. You are selling a psa 2 1933 Goudey Ruth Red. Potential buyer looks up comps on his phone and makes an offer based on that data.

2. You are buying a psa 2 1933 Goudey Ruth Red. Dealer has that card (with price identified), looks up comps on his phone and says he is right in line on a price.

I think a few years ago, this was frowned up. But now, not so sure. It seems more and more commonplace and accepted to do this (both as a buyer and seller). What do you think?