I think there is way more operators now in US with barcades and pinball renesance than in Europe. European pinball machines are exported to US because they are more expensive where you're at and that is the profit that can't be earned on the route anymore. Look at all those dutch and italian container deals.
I know my poor country is having all A and high B titles exported overseas and pinballs on location earn very little. Looking in european sites and forums it seems it is same there only their citizens have larger wallets, so their prices are between our and US (closer to US prices).

for example: TAF is 1700 EUR game here and $4500 routed in US. no way that game can earn more than couple of 100s eur here at most yearly (100 eur is 488 tokens bought if profit is 50/50 split with the bar owner) without calculating in breakage and repair costs. after taxes and shipping someone selling his TAF oversees makes an easy 1000-2000 EUR on the spot.

I'd guess Gary is making his stats up for the release purposes and that most he sells is to home collectors, probably most of it to US. There is no Nova anymore or large french distributors that buy half the stock at release.