PT question is this normal?

DS started going to PT because of torticollis.  He has already overcome almost all of it, the only goals he has to reach are holding his head to the left for 30 seconds in a prone and seated position which he did for me this weekend. In fact he did it for way longer than that. 

They told us they wanted us to come 2x a week originally but due to their schedule and my work schedule we haven't gone that often... yet he has still done great. we do his exercises at home religiously and work with him. 

 The appointments are nothing more than monitoring his development. They do not physically do any type of therapy with him at the appts.  I asked last time if he was delayed at all and she said he isn't if we use his adjusted age, which is what I was told to use.  Yet they want us to keep coming at least once a week.  I feel like they just want our money (we have a $25 copay and have already spent hundreds there).  I am also concerned because my insurance only covers 20 appts in a year and our year goes until July 31.  He's already done 10 appts. So if there is a delay later we won't be able to go get treatment.  He doesn't qualify for EI right now because there are no delays.  

So I guess what I'm asking is whether it is normal to not really do anything other than evaluate the baby at every appt? I understand we need to monitor his development but he is developing at the right rate and in the expected order as per the PT.  I feel like they are just feeding into my insecurities with having a preemie. If he was full term I feel like they'd just say he will develop at his own rate and because he is a preemie they want him to develop faster than he should be. It is really stressing me out.  I am going to ask my pedi for a second opinion at his 6 month appt in a few weeks but I was wondering what you think.