Pass on the 'cool' judgment as OOC threads rarely rank particularly highly in that category, but it is done. :3
(and yes, I'm aware that you didn't mean 'cool' in that capacity; spare my feeble attempt at contributing to the time-honored tradition of lame jokes)
And yeah, I guess it would depend on the format. My RPs tend to be more dynamic/action-driven/what-have-you by nature, so a smaller, focused cast helps them run smoothly. I do so prefer a focused plotline that prevents people from going 'I dunno' what to post lol xD' or wandering off into some bizarre little world of their own which no other characters may enter; which is what has happened in all too many of the school/freeform-plot RPs I have participated in. Even in this one school-setting RP I'm trying out, I have every intention of driving all the characters out of the school's safety when the plot gets serious. XD
And yeah, that probably has it's advantages but...not a method I'll be employing myself, at least in the foreseeable future. *lonewolf*