I bought my long arm used..with no intention of doing anything other than my own quilts...my hobby...not a business. I do quilt for a very good friend...who says she likes what I do....and I also quilt for my daughter-in-law....I think the stress of getting a "stranger's" quilt to be what they want is way over my pay grade! I like knowing there is no hurry in finishing up a quilt, if it stays on the long arm for a week, no one is calling to ask when I'll finish their quilt!!
That being said...it's a personal decision...my feeling is that when your hobby/fun becomes a business, it's no longer fun.