I totally get the frustration of the obelisks being walled up for kill rooms and I have also thought that this is wrong. Lately though I have been considering the fact that I might be wrong on this, I can hear the rage already…
Is it not a good tactic for PVP to take control of any fast travel within your territory? The obelisk doesn’t stop game play, you can walk to the volcano or any other obelisk area. I am starting to think it is actually a wise play for tribes to take over an obelisk. When we are warring with other tribes we often have people stand guard watching the obelisk for players coming to support the fight or to sneak bombs quickly to a base.
If a tribe can trap that player and take the bombs or siege materials, it actually seems like a logical and tactical advantage. Now the nice thing to do when not at war, would to leave a gate open for non-raid time or peace time. Lets face it though overall PVP is not based on being nice to a potential enemy.
On PVE servers there is no justification to block it but PVP it seems like a smart play.