Are we counting stickies? Because Real Life Meetings of Members has two posts and 34,918 views (17,459 : 1), and The MMP FAQ has 25,668 views and only 1 post.
Outside of stickies, nothing else in MPSIMS meets the same ratio: I checked by going to the forum page, viewing all threads since the beginning, and sorting by number of views. Since any thread with a higher ratio must necessarily have more than 16134 views, it didn’t take long to search through them manually.
Checking a couple more forums, IMHO doesn’t have anything that competes, sticky or no.
In ATMB, FAQs - Please Read First - Rules, Guidelines, Etiquette, Technical Issues unsurprisingly gets 50,144 views with only 2 posts, but that still puts it a hair behind the MMP FAQ. Why we require subscriptions, and how to subscribe has a whopping 145,336 views with only three posts, but that would be a former sticky, as was Beginner’s Guide to Glossary of Terms on Straight Dope Message Boards (34,838:2). Nothing else in ATMB looks close.
In GQ, we get an unqualified new champion: Did Edward Mordrake realy exist and if so, did he have two faces?, with 185,470 views, and 10 total posts (18,547 : 1). And another champion yet: Netflix on iPad: remove from “Continue Watching” list?, with 121,948 views and 4 posts (30,487 : 1). Even better is How much would paving 1/4 mile of road cost?, at 99,647 : 3 (33,232 :1).
I’m not going to go through all of the fora like this, and I skipped over some that weren’t as high as the current champ, but the 1/4 mile looks like the current champ, unless the former-sticky why we require subscriptions counts.