Free stuff is always good, but when I can, I like to see that someone gets something back.
The database, and the Radio Reference forums might be free to the members, but they were NOT free to the site owner. I'm not a sponge, and I don't like to mooch any resources that were laid out here, even if "free" members were allowed to use them. I used to be a "free" member, then I got to dipping into the database heavily, and posting heavily.
I figured if I was gonna hang out here all the time, and beat off on the forum and take information from the database, I should donate a few bucks.
But on the note of adding frequencies, and incentives and such, I think the idea would suck. The database is free for all members, paying or not. I do hope it stays this way, but if it doesn't, I'll still contribute $$, and I'll still contribute frequency information to help out the next guy.
The incentive for adding a frequency to the database, is just that. You're helping out the "next guy" that buys a scanner and needs frequency information.
Friend, how many times have you searched for frequency information for your area only to come up with some outdated list?
Your incentive is to lend a hand to a fellow scanner listener who needs information.
It's like a blood drive. YOU do not benefit from donating. However, someone who NEEDS what you did donate, will be forever grateful.