I had a Grace quilting table with a Janome 1600DP machine mounted and did all my quilts on it. Problem was the neck of the machine wasn't long and by the time the quilt was near the end, I had only about 3" of space to quilt - so in June I upgraded to the Tin Lizzie. I had no trouble cost justifying the Grace setup because when I bought it I had 10 unquilted tops ready to quilt, so it was already paid for (saved all those quilting fees). By the time I upgraded last June, I had quilted another 34 quilts on it - again saving all those fees. I expect to gain more expertise with the new machine because it gives me a full 12" of quilting space when the quilt is fuly rolled up on the takeup bar. It will take me a while to recover the cost, but I expect I'll do that because I love quilting them as much as choosing the fabrics, patterns, and piecing them, so I don't imagine it will take me too long. I really love the entire process.
I don't think I'll ever buy 1 of those big long arms with the computer and all because I don't believe I could ever make enough quilts to pay for it, though.