I do not think that the price is the attractive thing in using a VPN because there are many services that claim to be free, but some other factors may make the user pay up to $ 20 a month, the most important of which are:
No activity or connection logs
Our VPN does not and will never log traffic data, DNS queries, or anything that could be used to identify you.
If a method is provided to the user so that he can verify that this data will be deleted or at least it will not be obtained except at the request of the court and is not granted to any outside parties, then I think that the price will not be meaningful.
Speed, the cleanliness of the IP address, and that it is not prohibited or known to the service providers with the ability to hide the main address using Tor or any other service.