Yup as long as you've got confidence why not, there is one other BJJ school in my town .. and he doesnt allow inter school training and has kicked out one of my guys. But hey if you own a school and dont let guys roll there to check it out how do they know what you have to offer, and in some cases it makes you look intimidated by new comers. If you're slick the new comer will be addicted like crack cocaine and then you gots a student.of course you get the odd meat ball, but they get weeded out fast in a good school.