I do not agree with you. $ 7.99 is a decent price.
Take the example of a classic CMS like Wordpress, you must pay at least $ 50 to have a template (On Appdrag everything is free and especially infinitely because you can change the template whenever you want), then you have to buy the server which is a little at $ 5 per month, which is a shared server with about 200,000 site on the same server (Appdrag has an overpowered server hosted by the most secure) and then you have to buy your domain name (at about $ 2 per month)
Then you have the maintenance of Appdrag, which is free and you don't have to worry about anything, every year on wordpress you have to upgrade your site, the modules do not agree well with the others and you have to call every year a developer So the bill goes up.
In conclusion I don't think that $ 100 a year for all this is not worth them.