I do not habit to play for the poster before seeing freedom, but this time I will dare it.
The difference that Fetel has from the rest is now too large to be covered within 4 days that is the gap space from the foregone Grand Prix.
The 1.65 offered by interwetten to get another sale from Vettel may seem small but it is not based on Red Bull's difference from the competition. The only threat for Vettel is only Weber's teammate, from whom he has been defeated a few times this year.
So we go for another sale of the Seb with a small stake.