In answer to your original question, hot stone is very popular indeed.
As already commented, it is a luxury treatment, so market it as a luxury.
for us therapists, we dont have to press so hard as the heat and the weight of the stone does all the work for us.
what is time consuming is the set up, heating, cleaning up and preparing for the next client.
saying that, I have achieved 6 hot stone massages consequetively in one day.
please also remember, that any heat treatment does make us tired, as our body is constantly trying to maintain our optimum heat.
A real winter warmer, a fabulous add on to many many treatments.
Marketing tip for you: if your stones are heated up, why not introduce them to a client having a treatment?
Include them in a foot massage, a hand massage, a face massage, a scalp massage, a back massage, a stomach massage. Give your clients stones to hold. If its a cold day, use the stones to heat their feet up, their hands up.
by introducing them to a taster, they will want to book in for a full treatment.
Now also remember, this treatment originated in Arizona, a hot place! So hot stones still has a place all year round, not a seasonal novelty treatment.
Once you have paid for your kit, no extra charge. I bought my kit many years ago for nearly £500 and its still going strong. You can now buy the same kit for £200. No running out of product, once bought, you are sorted.
I highly recommend hot stone as a perfect addition to a therapist that wants to offer quality treatments.