When I stopped DJing several years ago now I started to off load all the big stuff slowly over a period of time, always bought and sold when active on the scene to fund new records etc. I think it depends on many factors if you decide to sell, I didn't feel I could justify sitting on the likes of Jimmy Burns, George Blackwell, Cashmeres, Johnny Rodgers, Hayes Cotton and dozens more, I have firstly no regrets at all, miss them yes sometimes but it's funny I still collect little bits and bobs so it's certainly right about being in your blood, someone made the point of if you have big records it's nice to play them to an audience which from my perspective was very true as there is no better feeling in the world than sharing the music with others, if I won the lottery would I buy them back bet your life I would lol, not really being involved with the scene anymore certainly made selling some of the records easier as I think when you a caught up in the moment the thrill of DJ'ing the buzz of the scene chasing the next big tune etc. all plays it's part in the magic and passion for collecting, when it becomes less important and you can separate the emotional attachment to the records then that also makes it easier to part with them.