The satisfaction given from building huge things within Minecraft is what makes it worth it. That, and the money you can make from taking a video of it and putting it on YouTube.
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This has been intresting (i thumb uped). But I play MineCraft on a daily basis (before you say, yes i know i have an addiction). So I know some REAL pointless achievments. EX: For an ACTUAL achievment (meaning a MC achievment), you would hav to spend 2-3 hours mining, crafting and building a useless railroad to get the 1K Mile MC Achievment. So yea if you want to know about pointless MineCraft achievments, take it upon someone who actually DONE some. (BTW those arn't pointless. some players just like to build (for NO reason))