Honestly, I think the main problem is reception. I've toyed with the idea of entering my corp into PC, and the 1 major concern is not the ringers, or even the costs, it's the fact that you see the squads of established PC corps in pubs, and many of them are just bastards to fight against. Camping uplinks, people exploiting broken/unbalance mechanics, hard to fight against packs of FotM. All I can think is that my corp made up of my friends would love to test our mettle against these corps, but if we can't just run the fun fits we made, and instead have to run full anti-frustrating-tactics fits, it quickly looses its appeal. I'd much rather avoid the stress of fighting a large, talent pooling group of people with functionally unlimited money, doing stuff that makes them unfun to fight against. No point when even if I win a district, and even if I can defend it every day when I don't have the billions of isk to hire alliance ringers/purchase clone packs. I'll stick to running pubs with my friends, with the occasional FW to mix it up.