I think it's a great idea, as long as it does not run afoul of eBay's link policies (and so far your listing has remained open).

There are some new seller policies taking effect in October, but this isn't one of them. There will be a lot of new photo policies (no text can be added to photos, limits on the border around a photo, every listing must have a photo, no stock photos can be shown for used products). We have to always be on our toes as eBay "improves" the selling experience for us.