Obviously the site isn't anywhere near accurate to the price of how much this would cost, it was simply to empathize how expensive a Blockland Forum app would cost to develop and maintain.
As for;There is very few options to select from, for example; no user login, email login was the closest thing to it. Try it yourself.
Even if Badspot used a service such as this (which he would not), the actual price of this project, as estimated by this site, would be $8000 (as just an iPhone app, but the process would be so simple for porting it to other iOS devices that it might add $10). You added on a BUNCH of stuff that wouldn't actually go into making the app.
Login? Already exists.
Profiles? Already exists.
Logo/Icon? Already exists (for the most part). And even if I didn't I could make one in 10 minutes the would work, for free.
Ratings/Reviews? What even?
You could probably ask anyone who frequents Coding Help and who is worth their salt to make this app (really just a shell, if we're being honest) in a day. Sorry, but that's just how it is. Don't necessarily trust an estimate of a site that gives you a few options to choose from.