You have nothing to feel guilty about as far as I can tell. You bought your copy to enjoy. I could have made do with the official DVD quad mix, reversed as it is, my QPS dts conversion even though sourced from someone's tape or 8 track, or my SQ LP. But we're not to be blamed for wanting what will be the highest quality, go-to version of this album with all formats covered.
Even if an enthusiast buys 2 copies, like I wanted to, whether for a gift, to have a backup or some such, even to sell 1 to a fan who missed out, I think that's cool. But I assume as a huge quad fan, you didn't buy it to deliberately flip for a high profit as some auction sellers do. That's what gripes.
As far a illegal downloads, personally all I've ever done is learn to rip a disc that wouldn't play in 4 ch with the Trinnov Altitude, but plays when ripped to a file in Roon. I can only speak for myself but I've never used Napster in its orig form, never went to a torrent site or obtained bootlegged discs.
