You might be seeing what is being mentioned above. In more detail, Verizon's "Enhanced" plan includes any speed from 1.1Mbps to the 15Mbps speed on the download, and anything from 384kbps upload to 1Mbps upload. To go from 1.1Mbps to 15Mbps is absolutely free since it's within the same pacakge.
Really, though, Verizon has two packages. Up to 1Mbps, and 1.1 to 15Mbps. You may be seeing the Enhanced package getting broken up into levels, or you could be seeing bundles.
The distance from provider determines the speed u actually get. If you pay for 7mg speed and physically only get 3mg then you will get drop outs,. do not use a test for speed that lets you're ip address out to public domain.good luck verizon service has gone to a lot less quality than say bell atlantic was.. U might want to check anyone locally that has att.