You don't have to beta test it if you don't want to. But if you ever looked at the production of many video games, they are beta tested to extremes. Same with software and other electronic products. Even tangible products are "beta-tested." There will always be a marketing survey, trial & error, and research on private grouped consumers prior to major release to the public.
You also should realize that when a product is being tested, bugs are being removed. Every build is more efficient than the previous one. Beta testing & beta testers are not "a measure of the general consumers needs and expectations for this product." It is simply to test to see if the product is working efficiently.
Here is my guess. RC 1 will be released sometime in may, and the final product will be released approximately 2 weeks after RC 1.