I don't run away from anything, let alone run off screaming; instead I find the problem and deal with it. If I ran off, then WorldPay would be making an awful lot more money from us in chargebacks every month.
I don't know if they're on RIPE or not - all I know is that these are IPs and IP subnets have attempted to defraud our company or other reputable
hosts who have shared their experiences on this very topic.
How can you get burned? Quite a few ways really:
1. Chargeback fees
2. Erroneous domain registration
3. Propensity for SPAM operations to emanate from your servers.
4. Possibility of losing merchant account
5. Accounting nightmare - gotta love the tax man
Please remember that the above only applies to those who try to defraud us. Going over bandwidth allocations could only happen to a bona-fide, existing client and even then we communicate with the client as to address this situation before it arises (extra bandwidth etc.)
Lastly, there's no such thing as a dumb question. It'd be dumber to live in ignorance.