In a nut shell, would you be upset if all you paid in tax for 100K income is $4000 per year?
If Americans were truly taxed in terms of how much things actually cost to do, you could probably halve the amount that is paid in taxes easily.
I did look. Thanks, it is an interesting concept. I like the simplicity of the APT tax and the elimination of the income and other taxes. However, the simplicity and low rate is also the problem. If 0.35% is revenue neutral, then 0.45% may pay for more government programs, and 0.55% would pay for even more pet political projects, etc. The transaction tax isn't clearly visible and is paid along the chain of transactions. Sounds like the VAT. I prefer a national sales tax along the line of the FairTax precisely because it is so high (upwards of 30%) to be revenue neutral and so clearly visible as a separate line on the sales receipt stating "Federal Sales Tax."
Ultimately, the issue really isn't taxing it is spending. Taxes are the symptom and run away spending is the illness. The smaller the percentage and less visible, the easier it is to raise and feed more spending. On that count, I would oppose the APT. Make taxes as clearly visible as possible and paid by the every consumer. When the true cost of the beast is visible to all is when you will get agreement to reduce spending.