The fixtures installed in even the high end RVs only cost the manufacturer about $4 to $5 each (bulb included) when they buy them by the truckload. It is all about how cheaply they can throw them together.
In my camper I retrofitted LED assemblies from wired.com
. The ones I bought only cost about $4 each and are at least as bright as the incandescent bulbs originally installed. I also bought a 24" low profile bar light
with over 100 LEDs to install over the galley that is extremely bright and only cost $28. The small bulbs only draw about 300mA and the bar light
draws about 600mA. That's a lot better than the 1.4A drawn by the 197 bulbs.