It's about cost to them, not features or performance for the consumer. They won't take a haircut until Zen is out in volume. There's no way the bottom SKU could be so cheap or that would imperil sales of the lower cost (but now very high price) Skylake i7. Skylake and BW-E should fall in price later in '16 when presumably AMD will have reasonable inventory ... until then, no way José.
A skylake 6700k die does not cost Intel north of £250 to make not even close. A '6800k' wont cost intel anything like £250 to make, package and distribute either. Intel already priced the 6700k so that I retailed perilously close to the 5820k. This did not stop stock shortages for the 6700k....
There may be a price bump for the bottom rung six core broadwell-e cpu over the 5820k but it will be relatively modest. Chip shortages' *may* inflate the price ala 6700k of late
Intel wont price it too far north of the 5820k because the chip simply won't have much more to offer.
Regular haswell to broadwell only brought improvements in igpu and power consumption
There's no igpu to buff with consumer socket 2011-3 processors and so people aren't going to pay much more for a '6800k' over a 5820k. Intel will know this and price accordingly...
To an extent they could get away with charging a premium for skylake as it was a new design with a new chipset with more modern features over z97. The same will not be true for broadwell-e over haswell-e
X99 owners are by definition going to, on average, feature more clued up buyers than the consumer sockets that Intel sell in far greater number. They will quickly spot Intel trying to pull a fast one selling us pretty much the same cpu at an inflated price.
Some people will however pay a premium for the rumored 10 core flagship cpu
Intel rarely makes significant drops to cpu pricing the just let then go eol