6500 a month??? doubt it. unless you have 48+ sectors plus some kids to reduce your "taxation" in switzerland.
in wizz you are highly depending on sectors and the contract you are on.
therefore on certain bases (ktw, vno etc) you go down sometimes to less than 4000 as a skipper!!! on others with "better" contracts you may reach 6000.
wizzair is very simple to describe:
good place for fo`s to gain a lot of hours quickly in the a320 (and most of them quite new)
good place for experienced fo`s to get a shot for an upgrade
good place for "local captains" since most of the time wizzair is the only "local" employer, therefore its not hard for wizz to be the best one
bad place for expat captains since salary is low, high commuting costs, massive amount of work in a very demanding environment, no social benefits, no pension plans, no nothing.
all in all it can be a good shot for certain people for a limited amount of time, however, if you plan for a long term career, you will not find it there unless you are "local".
thats why so many expats are leaving... and most of them dont stay a year...