Now if you don't have the time to make friends with someone first, then here are a few suggestions I have:
1. Make sure it's a killer product. If you have a killer product and are truly passionate about it your enthusiasm in your product will show in your proposal.
2. FedEx a physical product to these people. People don't throw out physical products because it makes them feel guilty. They will look at it -- but it's easy to delete an e-book (it doesn't cost anyone anything).
3. Send all of your marketing material with the physical product. Print out your sales copy from the site, send any promo emails you have, any testimonials, etc. If they can see that there isn't much work for them to do, but they will be offering a great product to their customers and making money, it's hard to say "no".
4. Tell them 'what's in it for them'. This is one of the top rules in writing sales copy to sell your product ... now why wouldn't you 'sell' to your JV partners. I see people overlook this far too often. Tell them exactly what they get, don't simply tell them how great your product is.