#1: You never really know how hard they are going with you or what they are up to. Maybe sometimes they will let you tap them. Maybe they are helping you and letting you practice positions, submissions, etc. by feeding you things. Maybe they are working on getting out of their bad positions. Maybe they just want to work on one specific thing and will keep going back to that position even if that means giving a sweep, a pass, etc.
I heard a story about one very high level guy that for a week, let a lower level guy (well, lower level than the high level guy, but compared to most everyone else, still a high level guy) tap him everytime they rolled. Then on the last day that the high level guy was in town, he D-E-S-T-R-O-Y-E-D the lower level guy!!! During the week, he was just playing around and letting the lower level guy do his thing…play his game…but all the while paying attention and making notes on his game. Then at the end, he put the universe back in order…sort of re-set the system.
Remember to keep your ego in check.
Everyone has good days. Everyone has bad days. BJJ is like the SAT's (or what the SAT's are in theory). It's the accumulation of knowledge over time...training is not just what you do in one day during one roll against one person. Training is not about one tap. It's about reactions to different situations...it's about your progress....which, of course, brings us back to mat time and practice, practice, practice.