I'm in a slightly different situation because I do 50% mind therapy, which means continually having to get new clients. I have a clinic once a week near Oxford Circus tube where I just pay rent and get no reception, marketing etc, but the location sells itself, and I have enough clients or client referrals that can make it into the centre of town, so that's OK. Otherwise, if I had a choice (and I do), I would always opt for commission, as this means the clinic will have to work hard to get you clients. I pay significantly less than 50% at my East London clinic, but then again, I have to supply towels, soap, tissues, couch roll, couch, and have even supplied chairs, not to mention marketing material. But the proprietor of the premises makes me appointments. Recently though, there have been a few changes. For instance, I take my own credit card payments, but the proprietor expects payment on the same day, which means I have to borrow the cash to make this payment. This is usually OK, however in the lean December and January period, this was a struggle, and around No Smoking Day, I will be making large sums all in a small period of time, so it will be a great strain on the finances if they all came in on credit card. Still, I'm happy there.
And I was in a clinic just like Aromababe where they took credit cards for their clients but not for the self-employed therapists, which was very hard as I then didn't have a credit card facility. My business was growing there until I moved to paying rent instead of commission, in which case it dropped dramatically (I was there for hypnotherapy, so no chance of seeing regular clients), and after trying everything I could do to stay there, I made the decision to leave and just operate from my own clinic for the day each week that I was there.
So if I was starting out again and someone offered 50% and doing all the donkey work, I would say yes quite happily.