[scoot]

I can't speak to the name (or even existence) of any fallacy that this describes, but pricing strategy you mentioned is known as price anchoring, where a higher number anchors the value against which the lower number is compared. Sometimes it's an explicit comparison of price, for or example where a higher price is offered, then "discounted" to a still high, but percieved bargain price; or a comparison of price to value (eg. ROI); or to an unrelated value that sets a subconscious numeric anchor for the price that follows.

This is relevant: http://danwin.com/2011/12/the-irrationality-of-price-anchori...