If a customer is going to have to do some importing upon first obtaining the application to allow for basic operation, this may be a deal-breaker for some.  My application has 95% of the "items" a user will need, and all they would need to do is plug in their own price defaults.  Their unique items can also be added as necessary.  But I want these 30 or so items to be a part of the purchased application as they are integral to it's use.