Because it's such a "Billsy" thing. The Bills could have been a dynasty in the 90's, but instead can only celebrate going to 4 straight SB's. Bills fans are the only ones who celebrate that, because we found a way to deal with our pain of that era. It's been so long since that happened, I've had to tell people that the Bills even went to SB's before because over time people only remember champions.
These stats are sadly right up our alley. So yes, until we get to and win a SB, these secondary things don't mean anything.