They shouldn’t be able to block any rare resource spawns, especially in PvE and PvE-C. But even in PvP, why allow that? Especially some place like Shattered Springs, or the Silver Mines, Etc. It can literally make a server unplayable. Some servers have very low populations. So a group becomes the Alpha there, and builds up, and then blocks off Shattered Springs. What are most clans going to do when they are new, and see that? Leave the server. This was also done on a fairly active PvP server. The Alpha was very active, and so they raided a lot, and used what they took, plus what they could farm, to block off Shattered Springs spawns. All of the spawns. People would come to the server, see that, and leave the server, usually with a derogatory comment towards the people who did it, and FUNCOM for allowing it to be done. Shattered Springs isn’t the most convenient. It’s the most plentiful. You can’t get in there until you have somebody who can make gas masks. The safest place is in the water, because it is easy to do it undetected. But Shattered Springs allows you to gather the most Brimstone, in the fastest time available.
It’s OK to block off things like trees, rocks, bushes, etc., because there are so many of them. Things like Brimstone, with how necessary it is, should not be able to be blocked.