And yes, I'm fairly certain they also get something from the fees charged for the medical exam kaya andami nilang palusot (notwithstanding the memo from LTO main at the time). Not all crooks in gov't get their dirty money from malversing funds or seeking bribes. Some have more "benign" rackets, clothed under a thin veneer of some (allegedly) legal justification to do so.
By the way, I actually know someone with progressively worsening Parkinson's disease that renewed his professional DL. So much for medical screening... I completely understand that he can't afford to lose his job but, what if someone loses their life because of that?