My suggestion is this: I play in GRAZED, and there's almost NEVER anyone who does Commerci let alone the group one. My suggestion isn't make it a single player as that would ruin the point of it, I would suggest dropping it down from a 3 player minimum to a 2 player minimum.
Reason: Sweetwater equips are ridiculously rare and no one ever really uses them as it's too annoying to get.