If you need a friend, get a dog !
i have been training 3-4 times a week in nogi for 2 years and have never been allowed to get position on a blackbelt never mind getting a sub.
Re-read my post above, you're missing the point. It's not the higher ranked belts giving away positions or submissions, it's the very new guys to get rid of their ego from the off. I've not tried it personally.