Is it unreasonable to seek people at the part of a fight as you are?

[Melch]

You aren't obligated to sacrifice your own spare time for the benefit of others and you are entitled to state whatever requirements you want in the PF as long as they aren't against the law or ToS.
Sure, I believe you have some moral obligation to help your FC mates, friends or static members but definitely not strangers (my opinion). If you waited untill whole server experienced some fight, you would never clear it.

Moral obligation to help your FC mates only if they want to contribute. Some people expect a FC to carry them. That's how wrong NA/EU mindset is.