Buy the upgrade and don't complain, or don't upgrade to mavericks and keep using your old software.
Personally i think the minor cost of an upgrade license for Parallels is negligible for such a technically superb product, and given that i now don't have to pay apple for upgrading the OS this year, ive actually spent LESS upgrading to Mavericks than i did upgrading to Mountain lion last time
If everyone expected you to do your job, but you only get paid for the first year, then after that you got nothing, even though they expected you to continue to work just as hard , you would quit, same with the Parallels team, you paid for a product, you paid a reasonable price for it, they do not owe you free upgrades for life.
Personally i think the minor cost of an upgrade license for Parallels is negligible for such a technically superb product, and given that i now don't have to pay apple for upgrading the OS this year, ive actually spent LESS upgrading to Mavericks than i did upgrading to Mountain lion last time
If everyone expected you to do your job, but you only get paid for the first year, then after that you got nothing, even though they expected you to continue to work just as hard , you would quit, same with the Parallels team, you paid for a product, you paid a reasonable price for it, they do not owe you free upgrades for life.