Yoshi's post about client server and cheating

[Coldfire]

Did I say they don't exist? No. But I haven't seen any, that means it can't be that serious of a problem.
Tell me then, how do people hack? Don't say botting, because that's a seperate issue and is not a hack.

There have been issues with "bots" using a modded client to attack targets from anywhere, there are hacks to detect exact locations of gathering spots, etc.
I've played this since beta and met some hackers myself(where it was pretty obvious). It is currently not an issue, yes, but only 'cause the game is pretty dead right now. It's the same with the RMT. There is a lack of customers so their numbers decline.