Jovanka... Just do what you want, you're a developer. You decide whether you listen to players or let them deal with it. Remember that players think not about the game, but about what the game have them to offer. Its egoism. Its normal. We don't want work more than being entertained. You're somewhat stuck to "more challenges" for players and always count on addicted ones who will swallow it down. I wont fall in offensive rhetorics, i truly don't want to have a reason to.
If you want us to pay, fine, go ahead. But then, we want another way to earn caps! If the entrance fee is supposed to be 1000 caps, as the worst case, let us do fetch quests around the map. 250 caps there, 250 caps here. This will be, i hope, enough entertainment for you.
The we can decide whether we pay, bore ourselves to death with fetch quests or participate on your amazing PvE instanced map adventure. Give us a choice instead of forcing upon us what's good for the game or not. Thank you.