I believe, RIPE charges both types of parties the same amount for independent number resources and ASNs. Can't tell for the other RIRs. The main difference is that organisations are usually obtain LIR status as well in order to remove an intermediary between them and the RIR. And LIR fees are substantial (1K EUR sign-up, 1.8K EUR per annum) and individuals are probably not eligible for the status.