Yep FB3 owners got a good deal. Doesn't mean that everything they produce can be given away free. A company that does that is called a charity and they only survive through donations. As much as I'm sure you'd like to see Bill on a street corner with a collecting box Gary, I don't think its any way to run a company.
Existing Pangolin owners should be glad of the FB3 freebie rather than berating Pangolin for not bankrupting themselves by giving their new flagship product away for free, especially when they've been offered a very generous 50% discount. When was the last time any other major laser software manufacturer offered 50% off for existing customers? They haven't to my knowledge.
The interface is similar as they're both designed along the lines of being much simpler to use however, Beyond is a far more powerful product and will continue to evolve into something far more powerful than it is now according to the Beyond website so I don't think we've seen everything yet.
To my knowledge its always been said updates were free not upgrades. Beyond is not an update to LD2000, its a completely new product. LD2000 owners still get free updates such as the soon to be released version 5.5.
So far as I'm aware they've always said free software updates not upgrades.