We would like to purchase it simply to keep someone else from building a house on it. It sounds like it would cost around $150,000.
However, it's not clear that it's a buildable lot. If it isn't there's no point in our buying it.
If I'm reading the survey map correctly, that lower end is about 150' wide. Assuming you have a typical 30' setback from each property line, that still leaves a 90' area in the middle where a house could be built. Even if there's a 30' road easement on the right side, there would still be 60' of buildable area. You could certainly fit a house in 60' (ours is 40'x40').
We have just about two acres, but it's kind of oddly shaped because the county road curves down and up along the top edge of the property. So we have a couple of triangular corners at the top left and top right (facing north) that are "unbuildable" because of set backs. We also have a road easement on the east side that would prevent us from building along 60' of the east side. Despite all those setbacks we had plenty of area for a house, garage, and septic field.
Thankfully, the development behind us put in their own road from the other direction, and there's a steep stream valley behind us. So the odds of our road easement ever being used now is extremely small. I checked with the county once about having the easement removed, but was essentially told that once it's on the books it's very expensive and nearly impossible to have it removed. So we're stuck with it and just have to hope it's never used.
The property across the road from us is also an odd shape. With various set backs and a 100' setback on each side of a stream that runs diagonally through the property I thought it was probably an unbuildable lot too. Of course, a developer managed to find the one buildable area up on the ridge to build a million dollar McMansion that overlooks our own property. So now we joke we live in the servants quarters down below. It was a sad day when that monstrosity was built after we moved out here to get away from things.
The property on our west side was purchased by a nice middle aged couple. They lived there a couple years and ended up buying the property behind both our lots to prevent someone from building on it. They ended up moving to a larger piece of property about a half mile up the road. As far as I know they still own both lots and rent out the house.
Even if the lot next to you is unbuildable for some reason, someone could buy it for the timber and log it all off at some point. Or, someone may buy it as "recreational" land to setup their camp trailer, ride motorcycles, have parties, or whatever. Or, mining, drilling for oil/natural gas, who knows...
Sadly, we couldn't afford to buy any of our surrounding properties. Developers came in and logged over 80 acres of forest, subdivided into roughly five acre lots, and banged up lots of mini-mansions. Thankfully forest has regrown in areas between lots so it doesn't feel like we're in a subdivision so much. But during the winter we can see the surrounding houses and access roads and realize how close everyone really is.
Unless you can afford a large 80-160 acre wooded parcel and build right in the middle of it, I don't think you can escape neighbors or surrounding development. Maybe if you could find a lot abutting a national forest or something.