said by delusion ftl :Bad analogy
A better one would be, that you can get new empty plates as quickly as you want, but after 2 plates, you have to wait 5 minutes between additional plates.
You still get an unlimited amount of whatever food you want, just at a slower pace.
YOUR analogy is bad because the data that is unlimited is not the same or as good as the first 2.5 GB. 3G is bad enough what can you do with 2G data? Nothing. You don't need unlimited data is it's just 2G.