I think it's not growing for a lot of factors mentioned elsewhere ITT, but I know several people who've done it for a long time and who aren't doing it anymore because they prefer the "culture" in other multifandom exchanges. And ultimately, it's losing old participants quicker than or (in the last two years) at least as quick as it's winning new participants.
Re: Why isn't Yuletide growing?
I think it's not growing for a lot of factors mentioned elsewhere ITT, but I know several people who've done it for a long time and who aren't doing it anymore because they prefer the "culture" in other multifandom exchanges. And ultimately, it's losing old participants quicker than or (in the last two years) at least as quick as it's winning new participants.