Once i have an album on vinyl. i never buy a different version of it. I'm on the mailing list for certain artists and I'm constantly getting e-mails for new re-issues. Amy Winehouse especially. I suppose when you only release two albums, and known for one, people will try to milk it. But does anyone seriously see a colored vinyl that's new and get a hard-on over it? I couldn't care less about coloured vinyls.
I have bought a few u2 albums multiple times for the deluxe editions. In those cases the bonus items were too much for me to turn down, but those were for TJT, TUF and AB. Haven't touched the newest one for ATYCLB.
The newly released 30th anniversary edition of Definitely MAybe has a lot of cool unreleased versions of the tracks, but i'd only purchase it on CD if anything.