You have not seen Incredi adverts on any Incredi Members emails because they don't send all of them to Incredi members, that would be redundant, that would be pointless and advertising to themselves to people that are already members, what they do is SEND THEM TO EVERYONE ELSE that you send emails to that do not use Incredimail!
Yes when you clear your cache depending on what program is doing the deleting you can see exactly what its deleting, and if Incredi has been used and cached it will show all that stuff Incredi puts in there emails too that your computer had to load and store, or block.
Candy is going to defend her beloved Incredimail that everybody hates because she doesn't receive the ads to her Incredimail account, even if the people on the receiving end of her emails that do not use Incredimail gets them every single time she sends them an email if there account isn't blocking them already.
And why bring up yahoo? To show that if yahoo sends ads its ok if Incredimail does it too? Yahoo isn't nearly as bad as Incredimail in that respect, Incredimail is renowned for its ads and junk it sends, its for children, but you refuse to believe it because you don't see any.
So Candys emails are going to continue to have dancing bears and a line of laughing monkeys in them with ads trying to get you to sign up with Incredimail.