That would be fairer if owning and maintaining a capital ship would require some efforts (at least commodities and credits consumed periodically in addition to regular RP activity) in the same way than owning and maintaining a POB. Eventually, sieging a POB with capital ships would require additional efforts to represent the extra cost of the assault (not only a RP post in the dedicated thread but also commodities to be collected and stocked prior the attack and credits). Maybe this is what we can expect from a RP server.