I used to keep the ticket stubs of the concerts I went to.
I also bought a programme to every gig I went to until a Skid Row gig in 1991 didnt have one so after that Ive only bought a few since. But none in last 15 years.

I also have a little collection of stuff that Ive caught from the stage when chucked in by the band.

I have a Panetera (Dimebags) plectrum from the Far Beyond Driven tour - the plectrum reads Far Beyond Drunk. I also have the some Wildhearts stuff.

My most bizzare thing is a plastic cup that I caught from Skids Rows Sebastian Bach. I was no where near the front but he got this plastic cup filled with water - took a mothful and threw the cup high into the air - it was heading straight towards me so I caught it!

I agree though that the internet has spoiled things like record fares.