i think with the doc you should take a view aout the "value" of your rooster in comparision to his salary.
In must weeks you will pay your octor for nothing, and when you put this money on a bank account and hire a level 2 doc(i like the massage speciality), you maybe could buy a "reserve" when somebody injures and sell him after the injured player is back in shape.
If you have some important and expensiv player you maybe don't have the payrlll, to buy a new one or the transfer fees + salary will be more expensiv then a "good" doctor.
The PR are a big questionmark for me, because i doesn't undertand the fansurvey and the small ups and down in the attendance pretty well even with a constant PR and in my eyes the PR earns the most money with higher attendance and not with marketing(but even there are a new system with maybe a bigger impact from the PR)