I recall this is not allowed. Are there any recourses in this kind situations? Threaten the ISP with LIR audit? ;-)
At this point, it would be more likely that any policy forbidding the sale of address space is abolished, I think. 8-)
On the contrary. However, I can beleive people are sloppy in their language with respect to this rule; when they say that they charge for the address space, they really are charging for the services associated with and the maintenance related to the address space. One important point to remember is that the address space does not become the customer's property "because he paid for it".
Extra fees for static vs. dynamic IP addresses (without proper RIPE documentation) are quite common.
That doesn't contradict the rule, I think. Regards, - Håvard