I recently left an association where cross-training,or even attending a seminar, at another dojo was forbidden as it was seen as disloyal. My husband, a jj professor, was not even allowed to assist in classes at my own school! I can appreciate the cultural bias of the master instructor but we found it difficult to reconcile our own martial arts "upbringing" with this school of thought. We were privledged to have been introduced to masters such as Wally Jay by our first teacher-and were encouraged to expand our knowledge of other styles by these teachers as well. Subsequent teachers also encouraged us to be open minded and accepting of other styles and martial artists regardless of their backgrounds. We felt that our own students desrved all that martial arts had to offer and felt it was in their best interests to allow them to experience the same martial "unbringing" that we had. That being said, we feel that students should have a good base in a single art before beginning another one-but no man should allow someone to dictate where they study or who they are loyal to.
Whether you agree on their validity or not, learning to kick high has the benefits of developing better balance, muscle control, flexibility, and strength (to name a few)....and that in turn makes any kick you do better.
I have done the Karate for Christmas thing in the past ($49 for 6 weeks and a free uniform, etc) and did not find it very productive. I find that internal referrals from present students work better as they can pre-qualify their friends and family and getting them into the school with FREE lessons as a gift from students makes more of an impact. Offering FREE lessons to them over the holiday break gets them into your school so they can see what you are all about and has had a better conversion rate for me.
Good advice here.... it is about what you bring to the community that will bring students to your program. You may also wish to look at another site for a kids program or partner with a boys/girls club, etc. it may pan out.
I started mine in a Community Center-cost me $1 a student per class. It was a good arrangement at the time-I am sure there are centers around DC that will negotiate something with you.