Is this argument bunk?

[Jewish-collector]

But at a show, I can get Leon to take a look at it to make sure it's as described before I spend my $5 on it.

[JasonL]

I think there's a huge discount applied to buying raw cards. In fact, unless I really don't care about the card's condition much (rare), I won't even buy a raw card off Ebay...so that's a 100% discount.

With raw cards, I have found that one man's EX is oftentimes my G-VG.
I really hate that surprise when I open the mail.

There should be no such discount applied to cards bought in person (raw or graded), or graded cards on EBay