Well, the first one has been created just recently and it's still for next week so you guys get to think if you'd join. The second one is already later so uhm, any ideas? The third one is still far away so we can think of that too. Also, the last one needs to be done pronto.
But as of "But if a tourny doesn't have 3 or more people show up for it, I say it should be deleted," I disagree. Any person could make a tourney that has only 3 people to ensure a quick winner. Like Rocky said, you have freedom to have a tourney whether it's 64 people or only 2.