Hi Pascal,
Here are some general tips for getting more sales:
* Maybe you can try to revamp your site by changing your photos from time to time. Good pictures convert to more sales. And statistics show that the more pictures you have, the higher the selling price. Maybe place in some athletic models and the like.
* Make sure your item description provides LOTS of detail. Buyers like to learn as much as possible about the item before they buy. The best sellers on eBay have lengthy product descriptions to ensure the buyer isn't left with questions that might prevent them from bidding.
* Try offering perks like faster shipping. Ship the DAY payment is received if possible. Buyers have high expectations and getting their item delivered in record time leaves a great impression. Maybe offer discounts or coupons to your first 50 buyers.
These tips may sound simple, but we see SO many people neglecting these things in their listings, it's just not funny. Nothing turns a buyer off like a grainy, dark photograph or a single-sentence product description.
Hope this helps!