No one asked you to "retain all your receipts" - that's merely the straw man (or woman) you dug up to make a shallow pretense of an argument. There are easier ways of arriving at the same information but apparently you can't think of any. That's your problem and not a failing of the FairTax.
The GSTs you cite as "lower" are only a part of the combined federal taxation laid on the populace in those countries and even those VAT portions are typically greater that the effective FairTax rate would be for most. So your attempt to take only a portion of the federal taxes the folks pay in those countries still fails. And the GSTs aren't "harder to evade" as most of the VAT countries (including those you mention) have discovered with the faking of invoices and other tax related paperwork while building a large bureaucracy built on that very paperwork. In a lot of respects it's as bad as our present income tax.
Your lame agreement that you have no tax system you back is really funny in view of the number of years you've spent attacking the FairTax and its supporters. And it's "riddled with flaws that stick out like a sore thumb" is even funnier since you've never been able to make a decent attack out of any of them despite continual attempts. Certainly I'd not give you 2-cents to come up with a tax plan. I'm pleased with the FairTax as it stands as are many others - and you have no competing tax plan to offer; that much is crystal clear.
In other words, you have nothing substantive to say.