QBs win games in the NFL, without a good one you're not going to win, unless you have a defence that makes NFL history (in the case of Dilfer)
Look at the last 30 SBs and almost every single one has a QB who was drafted in the first round on one side of the ball, if not both.
You can't win in the modern era of pass happy football with an "average" QB like lets say Matt Hassleback, you basically need other areas of the team to carry him, either the running game or the defence.
It's much easier to hit on one player QB and keep him, then it is to try to build a top 5 running attack or top 5 defence when you need to hit on 10 other guys and try to keep them all.
It's the norm of the NFL, and it's not going to change unless you start seeing teams with 7th round "average" QBs make it to the SB and win.
The way you should look at it is look how much Tom Brady makes... that factors in how they can sign other talent around him... now contrast that with Wilson and Rodgers... with their stupid one ring each. Shit even the Giants we wont with defense... Shit you seriously looked at the last 30 SBs? Last I checked the QB from Buffalo was better than the QB fro Dallas... Dallas had a running game from hell for that ugly fuck to run...
Now my thing is.. .go get your star QB... but draft him... now you tell me if you were running the Seahawsk, who can you sign now to do a damn thing for him?