Our local quilt shop rents out their LA machine. 1.You must take the course to get certification. They charge $100 for the certification course. Then you can rent the machine for $20/hr or $100/day. I have wanted to use a longarm machine every since I saw them being used many moons ago. I know there are many.many talent people who could do a wonderful job for me, and have hired these talented people with great success. My point is I would just like to do it myself. Imperfections and all, and I don't think I'm alone in this. So I would rent your machine.
Here is a thought. Can you get some kind of insurance on your machine? Maybe have people sign a waver? Good luck to you.