I can't understand the leap in logic between selling a thing you made and being greedy.
I think I understand the origin of the feeling. In essence, many people felt like part of a minecraft community. Some of them had played since a time when the world was 256 blocks on an edge and you could play any game mode you like so long as it's sandbox. People remembered feeling like they contributed to the game- even when all they did was upvote or link or share or whatever. As long as Minecraft remained the product of an indie game company, that feeling remained.
It is easy to understand why being sold off like so many pork bellies to a company that epitomized the soulless corporation left a bad taste in the mouth of so many, even while understanding and accepting the inherent justice of the sale. In the end, it's fair for people to say that they don't like the way they were treated without pretending that they'd have done differently (although anyone who says that they wouldn't have sold Minecraft off is a liar).
My personal feeling is that the sale was a good idea. Clearly Notch was tired of the limelight, and that's OK. And above all, none of this is the end of the world.
But this is getting far afield.
blocks, creepers, crafting, etc.