How to avoid?

It's 50/50 pretty much. Usually only bulk sellers who sell on the daily get the hammer, but some slip through the cracks and sell bills and bills but don't get found out. You're taking a risk RWT'ing at all.

Not 50-50 at all. 90% chance you won't get banned or better. I've traded huge amounts of money right off of my main. Hopping to f2p, and direct trading. I've never had a rwt ban of any kind, or roll back. Its mostly if you're going to sit at lummy north fountain and trade for 10 hours a day that'll get your account banned.

 

[Life Dealer]

You'll be safe, I've bought and sold some bills from my main account and never gotten a ban.