Sometimes, good ideas fail at being good businesses, and tough economic times expose that harsh reality quicker than others. Amid sky-high stock markets, we have to be careful to prune these names out of our portfolios.With combined experience of covering technology companies on Wall Street and working in Silicon Valley, and serving as an outside adviser to several seed-round startups, Gary Alexander has exposure to many of the themes shaping the industry today. He has been a regular contributor on Seeking ...