Let's see how much of this argument we can dig up, just for old time's sake, for us "old guard" (since I won't/can't admit to old timer, yet)

Generator cost per year: $80-$120 (figuring in the cost to buy a good generator and maintain over 10 years {arbitrary})
-- Cost per AX event (since this is an AX club, I'm told): $10-$15
Fuel for Generator: $5+ per event (remember, this now handles EVERYTHING so is on all the time, or also add expenses below)
"Cost" of dealing with fuel cans, stinking up the bus/trailer, dealing with fueling the generator, unloading and setting up the generator in a volunteer run club: significant for those actually stepping up to do it.
Cost to run the bus, when needed, for 6 hours during an event = $12-$15 (depending on the price of fuel,
using some assumptions on fuel consumption)
Cost to replace a deep cycle battery every few years= $5/event
Real actual $$ savings, Negligible.
Keeping things simple in a volunteer organization: pricelessOf course, all this assumes that the current equipment is actually working (not including trying to use a giant laser printer off an inverter, which was a bad idea from the start, IMO).