I disagree with all of these points made.
After working on a server with a friend of mine where we had this discussion it makes it more of a grind, this keeps players playing longer to get more money. Not only that but afking isn't the only way to get money. Bosses give 500 shards per boss and you dont even have to do alot of damage. Not only that but spawners are not as beneficial as you think, there are other ways of making more money that are 10x faster than spawners.
Making spawners easier to get will not grab more people, it will infact decrease the player count. I understand it is "Op" Lifesteal however making the money way too easy to get to the point where the prices on items sky rocket is too much.