most companies offer an inexpensive upgrade if you recently purchased their product.
not parallels. they want full upgrade price no matter what, every year it seems.
When mountain lion came out, every other software worked with it, or had a FREE upgrade...except parallels. Parallels forced you to upgrade for $50 because of a $20 OS upgrade? It doesn't make sense and it isn't fair to loyal customers that bought the product a few weeks too early.