This robotics upstart has surged 143% year to date, but early-stage revenue and a high price tag raise questions about the artificial intelligence (AI) automation story.Wall Street loves a good artificial intelligence (AI) story, and Richtech Robotics (RR -9.57%) fits perfectly. Service robots powered by Nvidia (NVDA -4.84%) chips are working in restaurants and hospitals, handling tasks humans would rather skip. The stock agrees -- shares are up 143% year to date and 852% over the prior 12 months, driven by ...