I don't know if you have done so already, but I suggest you read the "How it Works"
section on the Partner Database (it's free).
I think once you read it, you'll see that this service is not anything
like the free services that are available on the web. A couple of things stand out for me:
1) Speed and Convenience: You can locate a partner for a specific day at the outset--there's no negotiating a mutually convenient date. You can confirm a partner in under an hour, rather than days of email exchanges that often don't pan out.
2) Accountability: Each person on the Gunks Partner Database accumulates a history
based on how they treated their partners in the past. You can find out if a partner is reliable before driving a few hours to find out they're not.
3) Privacy: You don't need to give out your email address of phone number on-line. Only people you agree to partner with will have your phone number and email address. By not displaying an email address, it doesn't get "harvested" for the spambots
The Gunks.com system cost thousands of dollars to build, and took a year of work to create. I think you will find you get what you pay for.