I don't get the point of .mobi unless you want to be focused heavily towards mobile phones, or want to be a solely mobile site. I guess if you're a big business it's not biggie to buy a .mobi to redirect to mobile devices.
But if you are just making regular sites, ya, you don't need .mobi at all.
Even if you want a mobile version of your site, just use a sub-domain.
But I digress...
Just thought it funny you getting .mobi domains unless you really wanted to do something mobile with them.