The #1 mistake most personal trainers do is become presonal trainers.
You can note my big disdain for trainers, even though I am one. I work at a gym which employs 25 trainers - at least 5 of which NEVER worked out in their lives. LITERALLY. Some thought they loked good and tried out. Some were convinced to become trainers. Either way the boat floats they’re ridiculously unqualified and it pains me to see people invest $1,000 in someone with LESS experience than themselves!
The personal training industry is reaching dangerous new lows. Greedyness may pay off in the short term, but it’ll drive you bankrupt - both morally and financially - in the long run.
Morals ARE always more important than profit. An honest buck is worth $1000 earned dishonestly. I much prefer keep making a small buck honestly than sell a lack-of-results.
Just my input.