Hello,
Personally, I can see a reason why (getting) a /25 might be more expensive than a /27. Usually customers are pretty sloppy in documenting their need - and figuring out why they
I think a more serious issue is customers claiming "I can get a /24 from ISP x, either you also give me one or I don't sign". Next thing happening is sales coming to you requiring you fake a document explaining to RIPE why this customer does need a /24. Or - I have seen LIRs like this - give the customer the /24 without even doing any documentation ("who cares if RIPE notices in some years - I will be gone until then, let someone else clean up"). I don't mind ISPs charging for doing the documentation of assigning IPs, but I do mind if getting more IP addresses (without a real need of the customer) becomes an argument in selling. best regards, Wolfgang