Think of what the hospitals and doctors were doing with people landing at the airport who were found to be sitting near anyone on the plane at the height of the pandemic.
Also, I know someone who got very minor treatment and medicine at my local public hospital which cost him over 300 Bt, a few weeks later, for the exact same thing at a public hospital over 100 Ks away, it cost him about 90 Bt.
I am not saying all the doctors at public hospitals are money grabbers, but it would seem quite a lot of them are.