You CAN count some CSM's for profit
I depends mainly on how many cards sit in the discard tray before they get reinserted back into the machine. Though even with a full table worth of cards set into the discard tray three rounds, the pen is still bad.
I would not suggest you betting at a full table on someone else's circle. The person who controls the circle also ultimately has the right to make the play decisions. I wouldn't want to get into an argument about how to properly play a soft 18 or pair of 4's against a 5
If you are going to play CSM's, you need to find tables that are almost full, so you can get some degree of back-counting pen before moving in with a +1 or more bet. I also suggest to never sit and to stay on the move because as cards go back into the machine your count gets watered down and becomes worthless. I move to another table one to two hands after I know that a slug of small cards gets inserted back to the machine. Or of course, if the count tanks.
The highest true count I have ever played on a CSM was +5. I can't imagine finding a situation better than that. Just figure that about 99% of your play will be between +1 and +3. There is no reason to be playing if the count is not at least +1. Just stay on the move. Your act is that of a "table hopper".
You need also to know how many decks are in the CSM. Some have 5 and some have 4. The casino I play sometimes has 4, which isn't too bad.
If you constantly stay on the move and table hope / back count, you may be able to make a few bucks. Also back-count the tables more often where the dealer leaves more cards in the tray. That dealer is giving you more pen.
Ultimately though, I suggest you travel to find some greener pasture.