I was trying to learn c++ there was this really great and free site. I decided to turn ads on for them since everything was high quality and free.
There were a few ads that played, but they changed every few minutes. The ads were not the same width, so they they changed they pushed the text around.
So in the middle of reading all the text would jump around and make you lose your place.
It basically made their site completely unusable.
Then what do you suggest for an email client? My point is, you do the best you can and not make a big deal on couple thousand requests being handed over when there are 100m accounts.