When Tesla Motors opened its new showroom in Boulder, it did so in style. Hosting an invitation-only party, the automaker brought out a lively group of local politicians, environmentalists and entrepreneurs for a night of martinis, music and test-drives of the Tesla Roadster. A Tesla Roadster on display at the electric vehicle maker's new store in Boulder, Colorado.Eric Magnuson via FlickrThe much talked about, all-electric, luxury sports car has received as much attention for its price tag as anything else. At more than $100,000, few people are likely to buy a Roadster. But with a temporary Colorado tax-break reducing the …