I go 4xweek but as I'm not in US then I guess the money question is really not for me and so I will respond to the above post instead.

In terms of time, I'm in academia and my work time is flexible. Also, I have morning sessions, which on some days are very early morning.

As for the motivation - this is just part of my life right now and I'm used to it.
I don't really need any specific motivation for going to my sessions - this is just what I'm doing as part of my daily routine.

Regarding concentration, it is often difficult to switch mindsets and starting productive work after coming from session. However, with such frequent sessions, I think the therapy is conducted in principle differently compared to less frequent therapy. With once per week session you have to go and process and cover as much as possible and then there is a clear break of one week. With 4 weekly sessions the process feels almost like continuous and there is not that much pressure to cover much in any single session as there is time and thus important things reveal themselves quite naturally over time. There is no particular concentration or effort related to that.