Joanie was in fact, simply stringing Chachi along while waiting for a better catch. Unfortunately for Chachi he also held a large position in Sunncomm which he had purchased with all of his savings.
In the end the joke was on Joanie as Sunncomm, despite the protestations of STEHSUCKER, rose to over $10 per share and Chachi retired and moved to Beverly hills where he now has his own sitcom. A sad and poignant tale that holds lessons for each one of us.