Singles or doubles - this is a tactic that scales poorly as you go up the ladder.
It works early because people can't volley, can't control the depth or pace of their approach shots, and don't understand ceding court position if they've given up a sitter to someone who can consistently do something with it.
People tend to figure most of those things out at the same time though. I personally view this tactic as the mark of someone who usually plays against poor net players more than anything else (especially in doubles). And it's not like they give up easily because now they absolutely have to prove they can back you off the net so you get frustration passing shot errors in addition to volleys right to you, too
It works early because people can't volley, can't control the depth or pace of their approach shots, and don't understand ceding court position if they've given up a sitter to someone who can consistently do something with it.
People tend to figure most of those things out at the same time though. I personally view this tactic as the mark of someone who usually plays against poor net players more than anything else (especially in doubles). And it's not like they give up easily because now they absolutely have to prove they can back you off the net so you get frustration passing shot errors in addition to volleys right to you, too