I think it depends on the client...
Some people prefer someone to come to them for the convenience and it can be helpful if they have children or lack of time. Whereas some people would hate the idea of having someone in their home, they may think they won't get as good a service or maybe they just like getting out and having the 'salon experience'.
I work from home and have never had a problem gaining clients - people like my products, my treatments and the service I provide. I've had one of two people arrive (and clearly not read my website) and look horrified that I'm a home salon as its not what they were expecting and would never have chosen to visit a home salon. I think the key is letting people know that they are not getting anything less by not being in a high-street salon. And instead think of what they are gaining by having you come to them (so for me, I always promote that theres no hustle and bustle, its private, theres parking, very relaxing and quiet environment and no waiting around etc etc).
Maybe look at why you might not be getting the interest ...what are your advertising and marketing methods? are your treatments and products appealing to those in your local area? What are other local successful mobile therapists doing / charging? What are some ways that you can stand out from the other therapists?