That said though, the "concern" is the downstream effect. Other modifications would have to be made to hide the 0 price. (CSS could help there) and the payment and shipping modules might need some touching as well as the order email/invoice, etc...
The alternative which you started off with would be to modify the product listing portion to behave like it was before my above suggested change to the product listing option. I know either lat9 or ajeh have provided a code sample to do that. A difference of the above two methods is that as a showcase there would be no stock tracking or customer information gathered. The direction headed at the moment would require several changes to get things to "look right". There are some in between options, but they go back to the "impersonal" perspective which I do unfortunately understand.
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