I furthermore would like to suggest to add more blocks, like diamond ore, lapis lazuli ore, coal ore and redstone ore.
The prices shouldnt also be 1k per anything. Prices need to adapt to the use of the block.
For example fire: You dont buy it to place it down on the world, since it will go out anyway and to make it burn forever, you simply use flint and steel. You need many fire blocks and for only one reason: Crafting chainmail.
So fireblocks should be less expensive. This way, we motivate people to use this money sink and spend more money there.