I think it's a good idea, but to make it more reasonable you should be able to teleport to your friend if you've been to that area, including safari as well to save money and use your friend as your own servant :P. This'll overall make it better, but people with two computers (such as myself) will be able to grind more easily, making it more like cheating for both of your accounts, and you can't block IP addresses because people who live together will not be able to grind together, so I don't know what'll happen if this makes it.
Thank you for your time and consideration (if you had any) upon this idea.