$35,000 an acre sounds like land that's really close to a big city. I have 40 acres that's less then an hour from DFW with city water that might sell for $10,000 an acre, but I think $8,000 an acre is more realistic with it being so overgrown. My long term goal is to clean it up, maybe turn it into a hay pasture, and wait for it's to increase in value to something truly absurd. I'd take $35,000 an acre for it today if that was possible!!!!
The 68 acres that I live on has gone up in value, but not like the land closer to DFW. Not far from me, some commercial land just sold and they where asking $14,000 an acre, but I don't know what it sold for. They are putting a new County Road through it and dividing it up into small pieces that are for sale now. I saw that one of them is asking $15,000 an acre.
If you are really thinking about buying that 10 acres, I would check the comps in your area to see if it's a realistic price, or if it's just a listing for somebody dumb enough to pay that, then they can have it, type of listing. I've seen some of those out there that have been for sale for over a decade.
I'm also a believer in low balling on a price just to see what happens. It makes the realtors angry, but who cares? It's how I bought my land, and I know of other guys that have also gotten good prices on land that was listed for absurd amounts. A solid offer will sometimes be enough to make it happen.
Another consideration that might affect the price of land is the economy. Is it going to get better or worse. Will the Stock Market crash and land values increase, or will banking crash and lending will dry up and land will decline in value? Will the seller need cash for other things and take a lower price, or do they care, and they will let it sit regardless of what's going on?