How valuable are Elvis Presley photos at a private concert?

Answer 1

I don't know exactly what you mean by "private concert", but Elvis Presley photos have essentially zero value; he's been dead for almost forty years, so pictures of him aren't exactly "news". If you have pictures of Elvis performing at a particular venue and that venue doesn't already have copies, they might be willing to pay some small amount for them.

If you have pictures purporting to be of him doing a concert in your living room last week, they're fakes, but you might be able to get a little bit of money for them from the Weekly World News or some other tabloid, if they're good fakes.