You want to try playing ever 3 days non stop, constant travelling etc.
The money side is irrelevant, all top athletes have a difficult life , it's not the glamorous life it seems.
KDB is far from a natural athlete and it shows, add to that numerous serious injuries that have clearly taken a heavy toll.
Mentally top sports is incredibly difficult, the highs are enormous, followed by huge lows, coping with those is far from easy.
And again the financial rewards don't make mental or physical recovery any easier.