My two cents:
Sharing accounts in order to maximize ticket use, and therefore gain a huge advantage on the leaderboards, is unfair
Sharing accounts PURELY in order to let a F2P access otherwise inaccessible monsters, without gaining ANY benefit from it, is fair, and a good thing to do
Neither of these conversations belong in this thread, and they can instead be put here, where you can debate as much as you want. This is a thread about clans, and it is in no way related to the sharing of accounts