Here are some other threads that tackle this issue as well.
At one point in time I suggested there be some FAQ pages for some of these things, rather than community topics.
If this comes about there really should be a whole section devoted to this and data management as a whole.
An adjunct to this would likely be a minor dissertation in how the various acceleration techniques are used to get large file download speeds, but there's no way around radio being bound by the speed of light without going into a dissertation into quantum physics, wormholes, naquadah generators, etc.
Could you make a new thread with the comments you made on the Extreme excessive data usage post? If others contribute, we can pin the post for future reference.
Doing so will allow us to more easily bring up Mark's suggestion to have these topics covered in proper FAQs.