Interesting. I only play the classics myself so I rarely feel the need to update.
Here's what I'm reading..
Yeah, I'm in the same boat. Games that came out after about 1986 really don't interest me. Only thing that tempts me to try a new version is the HLSL simulated-CRT stuff.
I'm not buying that 2011 number. Considering that just over 9,000 games were added in all the years of MAME from 1997-2010 combined, it's hard to imagine actually adding 9,429 in only the last year (unless they, like, added one clone for every existing game, and even then the sheer workload that would be required makes it questionable).