Dave this is Dave......ok here goes I hope.........On jobs upwards of 1200 pounds I would sell the machine to the customer for 400, it costs me about 385 so its not done for profit...... my theory is 400 isnt to much for them to maintain their carpets inbetween me. These customers have spent maybe 2 or 300 pounds a yard for the carpet in the first place so have no problems wanting to look after them. There is no stipulation on me coming back in 6 months but...... see above...... Almost all the time I go back in 6 months......some customers want me the week before the holidays and then again the week after...... My profit is purely in the protection of the carpet hopefully when it is new and then every time I clean it....... By the way, the machine I leave isnt your normal spotting machine. It is capable of hight heat and has an upholstery tool with it, the customers love it, I even use one sometimes for furniture as it has a 2 1/2 gallon tank on it.......Also you must bear in mind, most of my customers have maids and or servants to do whatever spotting needs to be done, they of course dont do it themselves..... hope this helps, feel free to ask again if you have a question, best, Dave.