I've found in my experience that the problems does not really lie with getting in the number of players but getting them to commit for the full game.. in the last 3 or 4 i've been in (admittedly some of them were delayed starts waiting for people to arrive).. we've played like 2 hours and then people say "oh i didn't realise it would take so long' or 'i have to go'..

i've never played in a live game that actually finished.

Perhaps with your scheduled time (and obviously nmrs for those who break beyond that).. this might be less of a problem.