Dear Startup Investor Subscriber: Have you ever wondered what it’s like to be Mark Cuban or Lori Greiner, two of the sharks on the TV show, “Shark Tank”? Well, stop wondering and start experiencing it for yourself. On February 24, 7-8 p.m., the Startup Investor, together with our friends at RockThePost, is co-hosting a DEMO Day webinar featuring five exciting startups. These companies were personally chosen by me, culled from the dozens of companies listed on…