Keep the lvl 1 doc
I just bought a level 5 doctor for less than $10,000.
His wage must be huge, then is that so wise.....
In any case, it seems to me that you can find a level 4 doctor for around $9,000 a week or a level 3 for just under $7,000. So why would you stick with a level 1 and have a much higher risk of injuries? Not to mention that they'll recover slower and be out for longer.
because those 7k per week, is nearly a price for a new player at this stage and injuries aren't very often. In my eyes i would go for a level 2 with massage ability, or stay with the level one doctor.