I think the economy is playing a big part in sales just as in every other business.  Business is down all over the place from my convenience store to the post office where I work.  

If I were you I wouldn't give up on the idea.  Consider this, if sales are stagnate, perhaps what you add to the market place will create some activity.  Personally, I have enough textures and characters so architecture catches my eye.  :)

...... Kendra