Try ROA-LAS... $534 is the lowest fare. BLF/BKW - LAS only has $368 as the cheapest fare.
Yes, BloFares(tm) still exist on LCC... and in many cases, are worse than on the old US. It seems that LCC doesn't look at the competition's fares. I wonder who will fly LCC when people look at the options and see them priced lower (and with better service in some ways)?