I don't think that it's a big deal to put ridiculous values in that field, though probably you shouldn't. For reporting something second-hand, there's never been a standard, and as far as I'm concerned you can do whatever you want. Since it doesn't actually affect anything, it's basically the same to have riskedBTC=1 with a comment of "he stole BTC" as to just say in the comment "he stole 1 BTC".