Affiliate Sales Model or Guaranteed Ad Purchase: Which to Choose?

I was approached this afternoon by someone who was interested in promoting their real estate-related program to my site’s users. This advertiser wanted me to promote an online webinar and was willing to give me a commission for any sale made from people who went through the seminar and purchased their service. While the commission was fairly good, we felt that the odds of someone actually going through their entire webinar and then purchasing their product were not phenominal.

Choosing Between a Guaranteed Return and a Potential Greater One

We considered proposing a PPL (pay per lead) model to them, but felt that by doing so we were providing this company with tons of free branding for little in return. As a result, we decided that we would only work with them as pure advertises. They were welcome to advertise their program on our site, but would have to pay our full rates. If they generated any sales or leads, that depended on the users of our site.

What would you have done?

Do you go with the guaranteed advertising buy or do you provide free branding for someone on the remote chance that someone will go through all the steps (sign-up, webinar, sale) and buy their product?

In the best case scenario, we’d be able to charge for advertising and also get an affiliate payment per sale, but that isn’t ever going to happen. I tried to negotiate a few deals like that years ago and was simply laughed at. Was worth a shot, though!