I wish that for a variety of online activities, I could set a maximum bandwidth available for ads and have advertisers bid for it, to keep my system running fast. And in turn, Google (or others) could price its services based on how much bandwidth users put out for bid.
Edit: It should be obvious that you could do this with physical mail too.
In order to maintain access to (currently) free services without making one's computer unusable.
The problem I see is that the processing and bandwidth used by advertising are currently "as much as advertisers can get away with" and I think it's leading to a tragedy of the commons.
But I see no need to eliminate ads and free services either. There just needs to be a cap enforced on the resources used.
Edit: It should be obvious that you could do this with physical mail too.