Though the FPP system has the intention of retaining our trained specialist from leaving government service.. There will be several issues that will arise..
As Ibrahimovic mentioned, only the specialist will get the tip. Other staffs below are MAY NOT receive anything and still forced to do the work. There are some hospitals that pay the staff "locum pay" to compensate for this workers.. But these does not come from the paying patients, and the government will have to cough up the money. It is possible they will disallow this from happening later on.
The issue is having alot of trained specialist leaving the government service Its really a no-brainer. Specialist in private are paid 200-500% more than government pay. Even if the doctors are willing to stay, they will end up put their families in debt. No fully self sponsored medical education can pay back their education loan unless they work in private. Pension money is also chicken shit compared to the salary and working life outside.
The only advantage of staying in government service is the semi-immunity against medicolegal cases.
A third issue which i find is the most important issue, is the Bias treatment toward FFP.
In certain hospitals (sorry cant name these hospitals), FFP patients get to cut ques from the non-FFP patients.
Specialist would drop and postpone their other cases to jump at these FFPs.

PPUM and PPUKM are considered "semi private". The patients there are also full paying patients but are not the same FFP as in the Ministry of Health hospitals. PPUM and PPUKM are also training centers for Masters and Housemenship, so patients can be attended by Specialist, MO or HO. I have not heard of such warning letters as such as it is meant for the patients to be attended by MO and HOs, Ofcoz the specialist will be monitoring them, just as in government hospitals. The only difference is these centers may have slight higher quality of treatment as their Medical Officers are usually the Selected Masters Student to be specialist in the future.

But speaking of the other hospitals that provide FFPs, there has been ALOT of time where the specialist will order the MO/HO to attend to the FFP patient first. I find this ok IF the specialist is genuinely busy (eg in the middle of surgery), but there has been times, where the specialist are just lazy. But if it is such the case, patients can provide feedback and can request to change to another specialist.