Hi cd345 and welcome to INForum!
I don't think the domain is worth much. .Mobi is a pretty weak extension, so for a .mobi domain to have some value you need a pretty strong keyword.
When I started out domaining I did similar things to you. I would find domains owned by people like Frank Schilling in the .com and would buy the .info or something. So, you're not alone
Also, my recommendation is to avoid .mobi right now - certainly until you've got a bit more experience as a domainer.
I completely agree with Jeff. Along with good domain, its extension is also extremely important. Just imaging that you have a domain americaonline.mobi. I am sure you would feel great while reading the first half but second half just doesn't sound too good!