Always fill out the comment box to “sell” your platform. If you are given the opportunity to explain why you are interested in a program, do it! Use the space to highlight why you would be an asset to the program. Talk about how your audience is their audience. Talk about the size of your mailing list (if it’s significant). Talk about your success with similar programs. Talk about where and how you will promote (hopefully you’ve done a bit of research so you know what they’re hoping for). Don’t sound desperate and certainly don’t lie about anything, but be upfront and honest about how this will be a win for them.
Affiliate marketing is also called "performance marketing", in reference to how sales employees are typically being compensated. Such employees are typically paid a commission for each sale they close, and sometimes are paid performance incentives for exceeding objectives. Affiliates are not employed by the advertiser whose products or services they promote, but the compensation models applied to affiliate marketing are very similar to the ones used for people in the advertisers' internal sales department.