Furthermore, as someone who works in IT and in Runescape, I have to throw this out there because a lot of people don't understand this:
Just because something happened to you, does not mean it is normal. Coincidences occur, and the timing of the events that happen to you are not always related.
I too have heard that staking accounts are a lot more risky, but that's the nature of buying accounts that are heavily trafficked. If you want to be safer about it, ask to buy a rested account, and then after buying, rest it yourself for another week or two, then do some questing and skilling on it, etc.
Again, just because that was your experience, doesn't mean its the norm.