ok, first, i wouldn't call what you linked to raw land. It's an engineered subdivision.
every plat and subdivision in N King county and all of Snohomish county crosses either my, or one of 3 coworker's desks. i work in the engineering dept of the local telecom.
when a developer wants to divide up a large chunk of land, he goes through the permitting process, sends the plans to us, the power and sewer utilities, we come up with our plans and send him a bill. this allows him to sell lots with all utilities at the street. it will not pass the permitting process w/o these. other, more rural areas may be more lienient. check w/ your local planning dept. have the parcell number when you do.
i have a hard time thinking those costs are included in the price of that lot.
if you want recreational land, buy recreational land. it'll be cheaper, and it will have a reason you can't build a residence on it. flood plain, doesn't perk, too close to wetlands, etc. great for camping and cheap.
when you say raw land, i think in terms of rectangular acreage. land that hasn't been prepped for retail sales. much cheaper by the acre, but more acres. again, if a subdivision has failed in the past, it'll be called recreational land in the listing.
If i had the kind of assets you seem to have, and was looking for camping land, i would be looking for a timberland lot. potential income, and nobody nearby. and woods. but that is where my tastes run.
the great thing about land purchases is the feasibility contingency. it is expected in a land purchase agreement, and allows you to make an offer, knowing that if it doesn't work out the way you want, you have an escape clause.
raw land is riskier than retail lots, as you have to source your water septic power and access, should you want to build, or sell it as a building lot.
hope that helps.