This is my theory so should not be misinterpreted as fact.
40-50 or more years ago there were many small machine shops across the land, each had many well built lathes, mills, drill presses and other tools. As automation became less expensive much of the work disappeared from the small players due to the larger shops doing the same work for less cost. As these small shops went out of business the manual equipment was sold off and hobbyists/very small shops could buy excellent used equipment.
Meanwhile the machine manufacturers saw a decline in sales, there was no longer a market for well made $25,000 (adjusted for 1970's prices) lathes or mills and the companies still standing went on to produce very high end machines well beyond the reach of most small players.
Many will say that new machines are not made as well as old machines, this is untrue, a machine made in 2015 is far more well made and useful than a tool made in 1950, you simply can't afford it, as mentioned above, there is no middle ground. High End or low end, there is nothing in between.
The end result of this is that there is no middle ground for the low budget minded or hobbyist, much of the good old machines are now owned by a third or fourth owner, the supply of good old machines has run out. This leaves one with 2 choices, a $100,000 machine or a $10,000 machine.
Companies such as Grizzly and Enco have stepped in to fill this niche market, I began to see this 20 years ago when going to customers facilities that employed a good deal of automation, their maintenance shops would have Clausing ,Bridgeport or Hardinge machines, then I saw more and more Enco and Jet equipment as the years flew by, then none, many do no in house machining at all.
By the way this is not a knock on any one company, just my observations over 25 years in the business.