More on illegal immigration: a wall and bounties

Jerry Pournelle's site has an exchange between a letter writer and Jerry himself; suggestions that neither of them think will be tried. First a wall:

Put up a wall / fence / SOMETHING at our southern border. Patrol it, and give the patrols some teeth.

Then offer a bounty:

If we were to offer $2,500 to $5,000 a head for illegal immigrants delivered to the Border Patrol by bounty hunters, no questions asked – we don't mind if they turn in each other – with a very stiff hard labor sentence in a chain gang for repeat offenders, it would cost at most a couple of billion dollars a year, and the more it cost the more successful it would be.

There's more at the site. Are these things worth trying?