There is nothing at all wrong with selling something that you truly don’t think is going to give the consumer what they want. As long as you give an honest appraisal.
If what a client wants is permanent removal of the hair. This will not work.
If what they want is temporary removal of the hair like waxing. This may work. In some it will and in others it won’t. If a client is willing to spend $900 to find out and they understand the pros and cons, then who am I to refuse to sell it to them? They may be very satisfied with the results.
I would much rather they buy it from me where I am going to give them an honest appraisal (hopefully) than buy it from someone down the road who really just wants to make some money. Plus if they buy it from me and then later they want to move up to something permanent, then I am in a better position to help them mitigate some of the money they spent.
One of the thoughts I have had is to let them buy the machine and then let them apply the money they paid toward laser hair removal (with some sort of time limit). And that way they can have the machine and have laser hair removal.
Another option is to sell the machine to help control those pesky hairs that pop out once in a while. Assuming that it is helpful that way.
Does that help?