There are also the die-hard astrophotographers, who own more than one scope because one might be a guide scope and the other the imaging scope. Or one for short focal length and one for long.
If the 10" is too big and heavy for you to carry out to use regularly, then I wouldn't get it unless you can leave it setup. Like the others said, the best scope is the one you use.
In general, buying more scopes is because people get addicted to the hobby and want bigger and better
