I'll elaborate a little:
I started going to cons in 1989, back before the RPGA "Living" campaigns ever started. All the RPGA tournaments were "classic" style with pre-gen characters customized to the adventure. I tried Living City (and later, Living Jungle, Living Greyhawk, Fiving Death, Living Force, and several other continuing campaigns) but they didn't work well for me. It turns out that I greatly enjoy playing with strangers but that I'm driven by heavy roleplaying. I was finding less of the latter in the Living events.
As a result, I played or ran about 300 RPGA adventures, 90% with pre-gens. I got decent at it; I took best RPGA judge at GenCon for two or three years in a row, and had a lot of fun as a player as well. My participation waned as Living events rapidly grew in popularity and classic-style events were phased out, despite some decent (and some extremely ill-advised) attempts to keep them going. Nowadays I'm largely out of the RPGA loop.
My con attendance is limited nowadays to cons with strong "classic"-style support: GenCon (via other EN World members), the superb Anonycon (early December in CT), OGC Con (NH), and sometimes ConnCon (March, also in CT.) I tend to write and run my own adventures as well, as I usually have more fun doing so than I do running adventures that other people have written.
I have a heck of a lot of fun meeting people for the first time at the gaming table. How they roleplay tells you a lot about them, and it's a blast to finally meet the people we've been talking with online for years.