Only certain games would I consider a collector's edition, or whatever the dev calls the special edition for that game.
The only one I've purchased is the God of War 3: Ultimate Edition, which came with an alternate costume, soundtrack, 1 hour video documentary of Kratos, an artbook, and a real Pandora's Box replica that the games/artbook came in.
Was pretty sweet, but pretty expensive as well.
I say, if you want it, get it, that's what money is used for - buying shit.
“Anna, my strong, terrifying Anna.” -Cas
"You lack the requisite spine and testicular fortitude to study under me" -Elodin