What do you envisage this domain being used for?
The apps market is getting more interesting, and app related sites might be good for getting traffic, but for affiliates it's probably still quite difficult to monetise, unless you can write and sell the app yourself.
As far as the domain goes, I think you could have chosen a stronger word than "merchant" to target the apps market. When I read AppsMerchant, it doesn't give me a particularly good idea about the aims of the site.
Good luck with the domain.
Rgds