Hello,
well, it makes no difference for us if the change is small (just folder added) or bigger (change of domain). The process is fully automated. If you want to change the URL, you need to proceed through that link.
The fee is ment as just "symbolic" to prevent misuse of the tool. (it is price of 1 coffee in restaurant, so I guess, it should be acceptable for anyone)
If we were about changing the URL manually for you, it would have to be more expensive just to cover the time spent with it.
Hopefully you can understand that.