You get more liquids and blocks without having to shop and mine.What would be the purpose of this and what advantage would it add?
Yes, but you save time from mining making people like the server more.You can get infinite water using the method at spawn.
Infinite lava from the nether
And a lot of iron (20-50) per day depending on your voting streak (if you want buckets).
Skyblock is meant to be work to get the blocks, easiest way being a cobblestone generator.