They DO offer a "lite" version. It's called Amiga Forever Online and it costs $30. Although after reading about their complicated "packages", I'm not 100% sure if you get all the ROMs for that. Apparently there's an even lighter version called "Express Edition", which doesn't include WB 3.X, but I couldn't find that to buy anywhere.
Hmmm. It seems that if they are going to keep trying to sell old software they should revamp their packages and reduce their prices, IMHO.