Familiar story, often retold throughout Canon, Nikon, Leica and Olympus circles. "Are we paying through the nose just for the name!?". Probably.
When I complained bitterly about the price of a lens hood I was interested in on eBay, the seller shot back, "toughen up, princess ... all original, mint Pentax equipment will be expensive, and hoods are not an exception!". Well!
I retreated to lick my wounds; a week later, I bought both hoods: one for the 45mm and another for the 90mm. Jesus! Talk about throwing more than $180 away on lens hoods!!
But I'm a stickler for using the real thing, not after-market products, not Chinese knock-offs, definitely not round or collapsible hoods. I'll treasure these hoods along with everything else...
I use the hood designed for the 55mm on my 165mm LS with no problems. The hoods are not so much useful for shielding from the sun, but for shielding the lens from rain, especially in rainforests (my staple!).
There are Chinese-made hoods from eBay coming out of Hong Kong and China which would appear to be "similar" to the real McCoys from Pentax. They're cheaper. But remember one tenet of economics law,
you cannot pay a little and get a lot.
AND... a lot of good things come out of Sweden, as you know. What's the chance we'll see flat-pack lens hoods spring up in an IKEA store?