Imposing the control on the people who cause the least problems relative to the problem population is worse than the baseline. And most jurisdictions have laws

Imposing the control on the people who cause the least problems relative to the problem population is worse than the baseline. And most jurisdictions have laws promoting snitching on your neighbor for tax evasion anyway. You don't even really need the compact; just pour some of the fine revenue into enforcing property tax evasion. That simplifies it to just enforcing the fine against a percentage of registered wealth wherever you live, and the reciprocity challenge can be deferred to later. But then you're likely to score wherever the driver has their multitude of cars garaged. Billionaires will still escape, but people definitively in the upper class will be more effectively deterred.