I pay 30k miles a year for the club card, which I consider worth maybe $420 or so. I almost always travel with my partner, so every entry is for 2 people. I consider the membership well worth it at that price if traveling even just once a month. The President's Club status from Avis has also been pretty useful and they seem to offer regular incentives to spend on the card each quarter (for example, just got 6000 points for 1500 in regular spend).

That said, unless they offer me a super generous retention bonus this year I'll be dropping the card/membership since I've gone free agent and have been booking UA a lot less than before.