I have a tendency to start a lot of MMO's but never explore anything beyond mid game. I did this with WoW and Guild Wars back in the days and I've made countless characters over countless games since then, both subscription and f2p games.
I must've racked up at least 2000-3000 hours of MMO's over the years without experiencing any end game content.
I guess that's my "gaming shame"? Or maybe it's just weird.