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I wasn't sure if this matters. Do they take into account any of this kind of stuff? What do the look for?
"What do the look for?" - MONEY.
To get your site sponsored, all you have to do is pay the fee for that category. Fees vary according to the category where your site is listed. To find out the cost, visit their sponsored sites section and type in your URL. You will get the price at this point.
I've never had a site rejected to be sponsored, so I don't believe it's extensively reviewed. I do know that an editor looks over the site, but I don't think they'd reject your site if you have javascript or anything of the sort.