I remember a show I was wild to have a cast recording for that didn't produce one until years after I saw it - GRAND HOTEL.
In my teens, I ordinarily wouldn't buy cast recordings until I saw a show so I didn't get CABARET or THE HAPPY TIME or GEORGE M! until I saw those shows. But around the time of PROMISES PROMISES, when it was obvious I wasn't going to get in to see the show during its first year or two on the boards, I started buying cast recordings as soon as they came out. Sometimes, of course, I'd have the recordings of shows that after I heard them, I knew I didn't want to see them.