I couldn't disagree more...The act of spending money on the game is what makes it more exciting...By being emotionally (and financially) invested in a game, you just get sooo much more out of it...
For example:
All my 9 arcade games are setup for quarter play; there's something about feeling and hearing the quarter drop down the chute/mech and the sound of the machine coining-up that just squeezes out those endorphines. You're prepared for battle, and you don't want your quarter to be spent in vain.

As a D&B technician, I also setup those all-night grad-night parties with the games on freeplay. Perhaps it's the fact that your demographic has a shorter attention span, or just is far more interested in consoles...I just don't see the interest that you personally felt in most of the kids that attend these freeplay grad-nights. We also have have more games than your typical family fun center, as well as huge party rooms setup with free food, dancing, performers, etc.
I'm glad that you, unlike many of your contemporaries, feel an affinity for arcade gaming...It's just that the act of paying for a game really does enhance the overall experience.
P.S. Perhaps working in an arcade all day has changed me and killed a little of the child-like excitement that others like you would find.
