that's your opinion...if you want to track it, then you can be in charge of it.
if it's 12 people that see each other frequently, i could see it, especially if people aren't hip to it from the jump...i've never done it, nor have i ever been in a league where the interest declines.
Really? Are you telling me your last place guys set their lineups in week 11? Ours forgot all about it once no chance of a payout.