It's always been hard for me to wrap my mind around game rules for lowering prices for *better* items at higher tech levels.

All other things (advertising, reputation, tarrifs, taxes, etc) being equal, the demand for a premium item in any given market would be higher than the demand for an average item. Since price reflects demand, the premium item should always cost more. 

Maybe not a lot more (the nightly rate on my hotel's mountain view rooms averages $9 higher than the rate on rooms with a view of the back parking lot), but at least a little bit more. And certainly not less.