Except, as a fifth place team, your fans are going to feel worse about your season as next season starts. Meaning that your gate revenues next season are likely to be lower than the would have been if you finished fourth.
And since your whole league now knows you're a tanker, they're more likely to go after you in league games (never know when you'll decide to tank a game for one reason or another), thus making you more likely to lose games you might have won if people decided you weren't worth the risk of going after, further depressing your future gate receipts.
This doesn't sound right.
Fact: I was 400k worse off by not finishing 5th. So you are telling me I can recover more than 400k next season by finishing 1-2 place higher? I can't work it out. I really can't.
If tanking might have any impact on your results the reverse is true I'm afraid. Just ask yourself, if your opponent is going to tank, what would you do? Will you field your full strength team? If people know you tank a lot, they will speculate and field a weakened team in the hope that you might tank and field a better team elsewhere.