[drcy]

I think alterations and high graded graded cards is likely an issues. But that's not stuff that interests me (collecting-wise).

As someone said, mid to grade cards are nice.

There will be forgeries (and I know of another problem which I've subtly alluded to before), but I think photos are safe if you know what you're doing. News photos are generally safe. For the record, of what I've seen, PSA does a good job with photos. I'm sure there's lots of other memorabilia too that's safe if you know what you're doing. The areas that are more "scary" are autographs and game used-- but I deal in neither.