i made a chart, i dont know if im right but its how i analyze when to buy a new trainer
lets start if your trainer reaches 30k salary a week already ( level 5 reference ), since you bought a new one you pay additonal one week for the guy that is 30k plus the bidding for the new guy which has 150k for example. so thats total to 180k
in the event that the newly bought guy has a salary for exmaple of 19k a week,
i try to subtract the amount if you retain your old guy vs getting a new guy
old trainer new difference
salary trainer
salary
30000 19000 11,000
30675 19428 11,248
31365 19865 11,501
32071 20312 11,759
32792 20769 12,024
33530 21236 12,294
34285 21714 12,571
35056 22202 12,854
35845 22702 13,143
36651 23213 13,439
37476 23735 13,741
38319 24269 14,050
39181 24815 14,367
40063 25373 14,690
40965 25944 15,020
41886 26528 15,358
42829 27125 15,704
43792 27735 16,057
44778 28359 16,418
i find it since i shell out 180k to get the new guy i need to keep him around 14-15 weeks so my initial expenses to get him will pay off. because at the end of the 14 week i save around 178k already going for the new one instead of keeping the old.
then after that i can say its good decision to get a new trainer already. or in the sense you got your initial investment back.