Two possibilities here.
Intaway , being the "new kids on the block", have managed to get Corendon interested by saying they can find guys 1000€ a month cheaper
which they probably can (at least if the "victims" don't read PPRuNe )
Second possibility is simply that they are trousering 1000€ a month more than the other guys.
Anyway, bit of an own goal putting the salary in the Ad, they won't make that mistake again.
Hope not too many retards back the wrong horse simply due to not consulting PPRuNe first either.