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I love this business!
It's not widely known that it's possible to sell services on eBay, in fact there's a large category devoted to it, called ‘Speciality Services'. To give you an idea of some of the possibilities, some of the main sub-categories include:
Advice & Instruction. Artistic.
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Web and Computer services. As you can see, there's quite a range on offer, and bear in mind that there are specific niches even within each of these main sub-categories. For example, within the ‘eBay auction services' category, there's more categories such as appraisal, listing services, packing and shipping, and shopping assistance.
I bet that either you can provide a service that falls under one of these categories, or you know of someone else whose services you could promote (and take a commission).
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I would suggest that your first step is to browse these categories and see what people are offering. You'll soon see which topics are swamped with sellers thrashing each other on price, whereas others will have gaps in the market waiting to be filled by you.