Hey what you do with your records is your business, you can cut as many carvers as you like. The difference we have in the UK is some people do exactly what you've done (sold the rare ones) and cut a carver - then they DJ out playing the carvers of the records they used to own- that's the difference and that's unacceptable practice to my mind. If you haven't got the original vinyl you shouldn't play it out. If you have then by all means play it off a carver.
I also don't buy this "the punters don't care" malarky - down this way they do. In fact "up there" they do too. The only ones I've found that don't care are the "Have you got the Snake" brigade. As for "it's always happened" - yes it has, and I've always felt the same way about the Emidisc merchants of yesteryear. The only difference possibly in the 70s there was a lot less variety and a lot faster turnround of sounds with sounds breaking overnight, and a thirst for all the jocks to have a copy straight away. These days it takes years to get the rarities.
Rant over....for now.