Mega Crossovers

Are company wide mega crossovers worth it? They used to be few and far between, but recently we have gotten Final Crisis, Civil War, 52, Secret Invasion, and more. Are these supposed to be grand stories to remember or are they money grabs by the comic companies? I remember Secret Wars when it came out. It was a year long miniseries that took place just in it's own pages. It did introduce the Beyonder (bad idea) and the alien symbiote (cool at the time) that later became venom. What did Final Crisis do? Who knows, it was a Grant Morrison wet dream. I just know as a parent in the current economic climate, I can't keep up anymore due to the investment in price needed. Many stories will say they are part of the bigger story, but devote a line or 2 of throw away dialogue that wouldn't matter if you missed it, but since it applies to the maxi crossover the company will say it's part of the bigger story. 3 or 4 dollars for a line or 2? Please. I don't have the answer, but I'm curious about other opinions.