I would normally e-mail this to the developer, but since the Developer Site link isn't working...

"Please" is something you say when you want a favor. Paying someone for his product is only a favor if the product is overpriced.

"Register it" does not mean "pay for it." Don't use euphemisms. Just tell people how much it costs:

"SafariSpeed is $8."

And skip the part about "If you find this application useful." It should be obvious that if someone doesn't find it useful he's not going to pay for it. ;-)

Bottom line: If you're going to sell your work, don't beg. Provide a good product for a reasonable price and act like it's worth what you charge for it.