I've only ever used FMRTE to add realism to my games. Editing kits is the biggest reason for me, but it's also useful for fine-tuning player stats. I've even downgraded my own players so that they are more realistic (Arshavin being the latest example). It's also useful for adjusting other clubs' finances to reflex what's happening in real life.
I have no problem with someone wanting to "cheat" though. PC games are escapism and if someone wants to take Bishop's Stortford FC to the Champion League final then good luck to them.
FMRTE is brilliant and that's why I'm not spending any money on the SI IGE when Ruci really understands what FM fans want. Looking forward to more news on this shortly.