You're not asking me, but if home users are a target market then it would have to be $1 - $3 dollars per month. I could imagine scraping local events websites, banks, maybe online auctions, etc. When home users subscribed to one or two services, we could get away with $10 monthly. Now, with home users accustomed to $1 apps and subscribing to a dozen different services, $3 is about the maximum before signups drop significantly.