If folks won't join for the sake of being envolved and supporting your organization and if you decide they need a greater material motivator than try to add more motivators.
OK so far I get:
Satisfaction of supporting my organization
I'm eligable for COTY
I'll get the Bull Sheet
Organization voting rights
I can run for office
Restaurant Depot membership
Comfort Inn discount
So if that's not enough...... Maybe some more travel or BBQ related companies would add a small token to the effort.
Maybe KCBS can work a deal with Sams and Costco for discounted membership rates.
Maybe AAA would be willing to make a membership deal of some type for those that travel.
Maybe Discount Tire or NBT would offer members a one time discount coupon for an emergency tire repair.
Maybe Garmin GPS systems would offer a discout coupon on a new GPS system for members.
Maybe other motel chains can offer discounts.
How about sending new members one of those big coupon books for food and entertainment.
A Kingford Charcoal coupon.
Carvan canopys discount or upgrade
A KCBS bumper sticker.....