I have had my longarm for 15 months and have done 17 quilts on it . At an average of about $75 per quilt (a few were baby quilts), I have saved about $1275 or more which covers over 10% of the cost. I have not done any for other people yet, but may in the future. It would be paid off in about 9 years at this rate.
I absolutely love using it and can't wait to finish piecing the next quilt so that I can quilt it!