a guy in solo can do immensely more damage than the guy in open.
the guy in open needs to regularly cash in merits in case he gets killed by the other powers members who will likely be hunting him. he will often need to outfit his ship with different shields, often prismatic over BI-weave again limiting his time in system before he needs to go and cash in his merits or restock his SCB's.
doing PP in solo is a scumbag move because it has literally no way to disrupt your activities except by out grinding them. and the utter worst of the worst are the ones who exploit the fair play of their opponents who operate loud and proud in open by doing all their merit farming/fortifying/preparation in solo while they operate in open with PvP wings attacking their opponents who are doing the grind respectably.
What ever. I can't make myself more plain. Fill those Buckets if you want to succeed. All of the rest of that is justification (not in the good way) for your PvP bias. It's only result is frustration, for you. Everyone else just goes on with their game. As I know I will.