I would challenge you to find a place in the last 100 years the land has not increased in value 30 years after it was first purchased.

My grandfather came to Lyon County, NW Iowa, from Prussia, Germany today in 1883.  He bought a half section of land for $40 an acre.  A good share of it was prairie grass.  In 1920 he bought another 160 acres, at $390 an acre.  This was after the boom of WW I.  Farm prices and land began to fall.  He had financed the 160 acres.  Prices were so bad that he mortgaged the 320 acres that he had bought earlier in 1896, trying to hold on to both farms.  He ended up losing both farms by 1932.  My dad started farming in 1930, and in 1933 he ended up renting 320 acres over the line in Minnesota.  He did quite well from 1937 to 1942, to the point that he had $9000 saved up to buy a farm.  He ended up in 1942, buying 240 acres, 3 miles away from where  my grandfather had lost all his land.  He paid $75 an acre or $18,000 for the 240 acres. In 1952, he bought 320 acres a quarter of a mile away from his first farm and he paid $172 an acre, which came to $55,000 for a half section of land.  So, in 32 years, (1920)  the $390 land was only up to $175, (1952).