Top Ten Reasons Why There's a UFO Cover Up:

10.  money

9.  money

8.  money

7.  money

6. money

5.  money

4.  money

3.  money

2.  money

<drum roll, maestro!>

The Numero Uno, Numbah ONE reason why

THEY CAN'T TELL YOU ABOUT ALIENS IS BECAUSE THEY'RE AFRAID IT WILL WRECK
THEIR WORLD WIDE 

1.  money scam