If you didn't go 9-0, you don't deserve the lighthouse, just like if you didn't kill Skolas, you don't deserve the 35 treasure room. You pay for the challenge, not the rewards.
Until Vex, fatebringer, and black hammer drop from normal crucible playlists, you won't get to the lighthouse without getting some skill.
Edit 1: The goal of this thread was not to spread elitism or anything like that. I was simply stating that [i]in my opinion[/i] buying the dlc should not give you instant access to the lighthouse. The same thing applies to PoE. You didn't buy the dlc and get the loot from Skolas, you had to kill him to get your loot.
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But vex fate bringer and black hammer are terrible for pvp