I own a /24 from the early 90's, registered before ARIN and the other RIRs existed. It is considered a legacy block and I've never signed the legacy registration agreement, so no fees for me! I do have it routed to my home network over a "business broadband" connection.
I use my network mostly for experimentation and it is unlikely to be a target for hijack. If I were a commercial enterprise I would want RPKI for the future. Currently it seems mostly irrelevant in a practical sense, due to the small number of ASes actually validating.
