You got to watch for sales. I check
HomeBrewFinds daily.
During one of their fantastic sales I paid $15 for the
Keg Faucet Adaptor Assembly. It came complete with a generic (not CMB) MFL Quick-Disconnect, and a brass faucet with black tap handle. I wish I had bought a few, I really like them.
The only thing that gave up the ghost after a year of use was the (likely) Chinese made QD after I had boiled it in PBW. The collar had deformed. I guess they shouldn't be boiled, my bad.
I've seen the adaptors by themselves go for a similar price. No, they're not worth $30, IMO. And again, no, I never buy just one item. To absorb the shipping I wait until I have a bunch of other things to go with it. There's always something on the shopping list. Like Perlicks.
My Perlicks 525 SS fit fine on the adaptor, which is like a very short shank with a 1/4" female MFL on the keg end. Just don't leave it in Starsan for extended times, the chrome starts to pit and tarnish.