Don't believe everything you read on the internet. Grado never tried to pass them off as closed. They are vented. Not open back like the rest but vented. They don't sound like any other Grado I've heard which isn't all of them...Just the SR60, SR80, SR125, SR225, SR325, RS2, and RS1...so yeah, maybe they do sound like another Grado but if it's not one I've heard before then you're looking at comparing them to a Grado that costs quite a bit more then the Bushmill. So to say you can get a cheaper Grado that sounds the same? I don't think so. Not out of the box. Perhaps a stock lesser grade Grado that's modded and woodied.
As far as gimmick...maybe a little. They are a limited edition made from whiskey barrels, so yeah, a little gimmick in that perhaps. But the sound is real and different and Grado and they are woodies. So gimmick aside, you're getting a woodie Grado that's $200 less than the next woodie step up and IMO, pretty damn close if not as good, but different, than the RS2.
So again, your loss. Maybe someday you'll be lucky to hear a pair and change you mind. Maybe not.