Someone sitting at home for ten years with a pilot certificate isn't a user. Period.
I am in general agreement with you except for this line. But - it's an important distinction. I would say that every person, in every state, in every corner of the country is a user of the NAS system. Therefore, a national tax(in the form of avgas) is justified, and user fees are not.
When you live in St Louis, and you order a Maine lobster, it's a good bet that your lobster came in on a freight plane within the past 36 hours. You ordered lobster, you got lobster, and a plane got it to you - ergo, you are a 'user' of the NAS system. Just as if it were to come to you from a truck(possible of course) paying OTR diesel tax, and other taxes to use I 40. If you ordered a part for your Yugo from Amazon, and you decided to go for the UPS/FedEx shipping, you are a user of the NAS. If you have never sat in any aviation contraption in your life, but you own/rent a home, and drive a car, and eat food - you are a user of the NAS, to some small extent.
This -- is what the framers intended when they wrote those famous words of section 8 of the constitution; 'and the general welfare'. It is beneficial to ALL persons within the confines of the country to have a well established NAS. We all benefit collectively, and even someone as hell-bent on a fee based system of users pay, can see that this approach when done correctly is of very great value to the public.
Now, we get down to the EAA convention. Yes, I can see a justification for a fee based system, but as others have said, not a fee based system PLUS a contribution based on gas, PLUS a general revenue fund, PLUS contributions to the AATF:
Trust Fund revenues are derived from excise taxes on:
Domestic airline passenger tickets
Domestic airline passenger flight segments
International passenger arrivals and departures
Air cargo waybills
Amounts paid for the right to provide mileage awards
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All of these combined sources of funding provide for the benefit of the NAS, whether you fly an exec Falcon at FL380 back and forth across the country every week, or whether you sit in front of the tube and order a pocketwatch from HSN. Or - whether you attend EAA Airventure 2013.
So, we have a gen rev amount, a fuel tax percent, an excise tax, and now, as if that 's not enough, a new user tax. Sorry, not buying.