I think I'd take Peale's first hand knowledge of the actual $$ from a sampling of machines, than TOK's assumptions based on seeing machines merely "existing".
... 
Yes, the number of actual games sold, the Live! Tournament network, their cash payouts and that fact that Golden Tee 2009 is going to be out in the Fall are less important indicators of golf games being popular than the anecdotal evidence of someone taking less quarters out of machines.
The age of the machines, the time on location, and how much less money they earned over a specified time period is completely unimportant information. Less Quarters is all the commentary needed for conclusive analysis.
I surrender! 
I already said new machines and an approximate amount less. I'm very sorry I didn't spill the rest of the beans here!
New machines on locations less then six months and their income drops sharply after about the first three months.
Of course a company is going to be releasing new material with promotions. If IT never released anything else, they'd go completely out of business.
Their business is to sell to operators. The operators have to buy new stuff to keep people interested so they can keep making money. But in the network of ops I talk with they're not interested in golf, bowling or even that new beanbag game. They're going for a shooter (Buck Hunter Pro or whatnot) or a digital juke, like Touchtunes. Because people love shoving money into a machine that plays the music they want to hear.
TOK, you can argue all you want, but unless you work in the industry and can attest to what is actually going on there, as opposed to being a critic on the sidelines, your vision about popularity is viewed thru rose colored sunglasses.