WHen you roll with people that are less experienced than yourself, it is very easy to become overly concerned with just "winning" the roll instead of focusing on drilling/practicing new movements.
Some examples would be:
1) A guy who is awesome at guillotines doing nothing but tapping all of the white belts with that one move.
2) A guy with a very strong wrestling background spazzing out and only playing his top game against all of the white belts.
3) A guy with a super deadly guard game only playing bottom against all of the white belts.
I call this "A" game camping, where you only practice your best moves.
Rolling like this has its place, but most of the time it is not the right way to practice.
The short term benefit is that you will be better at playing your own game. However in the long run, your game will not evolve and you will have a very tough time beating anyone who is more advanced.
So remember, open your game up and don't be afraid to lose to your training partners, even if they are less experienced!
A repost, but the mendes brothers doing their leg drag pass