Thank you Ca3le. I am not sure I posted my question clayey enough. Your reply on the other hand is clear.
I guess what I am really trying to find out is, (assuming all other factors [iSP, equipment, geographic location, etc.] are the same) do people who pay for 250 get only 10, when people that pay for 25 are getting only 10?
If the person paying more get more consistently, the person paying less is subsidizing the bandwidth of the person paying more. If there is enough going around to give 25 or better to the person paying for 250, there should be enough for the person paying for 25 to get 25.