Actually, it's because the rest of you "scientists" end up publishing bullshit results that you got by chance.

I'm kind of joking - most other scientists don't collect enough data to have to worry about 1 in 10,000 events happening by chance. In medicine, though, I'm not joking at all - those guys publish absolute statistical garbage all the time, I hesitate to even consider it a science because the data dredging is so bad. I can "prove" just about anything if the publication standard is 95% significance...