"20 lines or less"

For it simply must be 20 lines or less
No longer, and your structure not a mess
For if your verse is mediocre
And the subject is Al Roker
We'll not stand for it in this contest!

If you can write of flowers, love and beauty
How nice!
And if you've no rythm, meter or reason
We pay full price!
Just type out a simple screed
On what star-crossed lover's need
And it's almost guaranteed
Top dollar, you'll receive

But it must be 20 lines or less!
Any more, is a sin without redress
We simply have no time
For a longish, metered rythm
So just finish quickly and be crowned the best!
As long as it is 20 lines or less.