They did in 2011 & 2012. Fortunately for them, a good proportion of the 2011 P2F guys found something else for 2012 so avoided being layed off (yet again) at the end of 2012. Of the guys they invited back in 2012 a high percentage had found something less "seasonal" so declined the offer. airB seem happy to continue like this, and, unlike some schemes , you did actually earn a salary, albeit not a good one, rather than being purely P2F. . but, that was 2011, don't know the exact deal now.