Brian,
If I am reading your question correctly you are interested in knowing if anyone is switching to flipping in the 250-500K range verses the typical 75-250K range - not when to use hardwood and granite. By the way those are the ranges I would use in my area not necessarily what someone on either coasts may call high end.
I am trying to move more high end (my last flip sold for 236K compared to my average sale price of around 120K) but am running into supply problems. It seems that buyers in the higher end usually have the means to purchase and fund the rehabs (or tear down/rebuild) themselves and are willing to pay significantly more than me due to 1. them not knowing what it really costs and 2. not factoring in things like holding cost and profit.
I like the higher end because my profit is based on percentages of ARV, the higher the ARV the more profit. The higher ARV also helps absorb any unexpected issues Replacing a main waste stack on this 236K flip cost me exactly what it did on a 89K flip I did last year.
I should mention that I have not abandoned the lower price point homes, just have expanded my price point higher.