those are some huuuuuge files!. My laptop would start smoking in advance, I'm sure.
You do realize this is going to backfire, don't you?
They'll be knocking on your door before you are through making fun of them...
If you are the only one that can open the file, who do you think will have to solve their problem??
At least you can say you did it to their specs, and will need to charge extra if you're going to have to produce other formats...