Regarding other region accounts..

So my main is a legit EU account and I've created a secondary US account for the THQ humble bundle.

I'm aware this is a bannable offense, although I haven't heard even once someone got banned for this.

Let's say Sony finds out. Will my US account be banned? What about my purchases?

Also, will my main account be banned for this as well?

I'm just a bit sceptical if it's worth it buying from the US account.

It wouldn't be tragic if they ban my US account from PSN, as long as I keep my purchases.

Edit: I guess I can ask it like this too: were you ever banned from PSN for whatever reason? Did they let you keep your digital purchases?