I'm in the UK and most therapists I know have more than one job, either they do some private work along with being employed somewhere or have a number of different things they're involved in eg training, development work etc. Yes for some there's a financial incentive but also for a lot of them seeing clients full time is too much, they would say that for them to stay fresh, not get overwhelmed and really be able to be with their clients, there needs to be a balance. Their other job may not be as demanding and could be easily manageable. My current T is semi retired and works part time but I know she still looks for balance in her work and I like that she takes care of herself.