Usually there are only a handful of Clickbank products with (close to) 0 gravity, and they're probably a rip-off anyways (I'd like to maintain a good relationship with my list, which doesn't involve selling them crap).
Then there are the physical items, but these have very low commissions (mostly around 10%), and I'm not sure they'd convert too well (ecommerce layout vs. a long sales letter).
Is having my own product the only viable option in a scenario like this? Or am I missing something here?
And on a related note, do you usually only promote digital goods/info products to your lists?