To be honest, I thought WarZ was the standalone version of DayZ, too, or perhaps a spin-off. As it turns out, it was just a money-grubbing rip-off instead.
I'm certainly glad I realized my mistake, since DayZ is actually good and WarZ is just highway robbery. I can't blame people for being ticked off about WarZ given that they promised a lot of features and a polished, complete game and have (supposedly) just begun to deliver.
Why did people have to pay for an alpha product, then a beta product anyway? Games toted as 'released and finished' (as Infestation Survivor Stories was) should be released and finished.