I'm new to Cpanel. I recently bought a new domain and, when after four days I couldn't find it in Cpanel, I was told by support that to use the new domain I'd have to install it as an add-on to the existing domain. The question is why would I by a domain for $10 when I could've installed it free as an add-on domain. Also what would happen to this domain and the WP sites I'm going to build on it when and if I decide to let the top domain expire?