I know I'm not the only one following all three. While I already know the PF albums, BOC and Devy are new to me. Even stacking on SB (whom I know) I do want to listen while participating, so a fourth will be a little taxing.
I guess the question is this... Are we more concerned with giving people enough to be interested in (for example, Jay's only following 1, so one more isn't a big deal), or are we more concerned about overloading people (eg, me and Hef)?
The latter potentially limits participation more so than the former. That's my only point.