Cost of Running a Dojo

After yesterday's post about creating styles, I wondered about how much it would cost to run a dojo. And how much I would need to make to have this be a full time job.

So, I'll show you the calculations:

Bare bones dojo (per month):

• Run in garage or living room or hall with at least 400 square feet of space - $0 (Assuming you or some one you know owns it and lets you use it for free.)
• Insurance - $450
• floor/mat cleaning- $199
• bathroom and other cleaning supplies - $50
• Blog, Youtube, webiste - $10
• Other advertising/notices (home printer, black and white) - $10
• Miscellaneous equipment - $100  

Total is $819.

If I were to charge $69 a month, I would need 12 students to just cover costs. Then, I would need at least another 15 students join my dojo and to pay for my daily expenses. Meaning I would need maybe 30 people in all. Quite a lot of people.