well i would presume there selling time share apartments,
they ask you to pay 15-30£ for a 3 week holiday once a year for life,in the said apartments,you can sell this time to any other people and keep the money,
when they have deposits from punters to build these apartments they bugger off with your hard earned cash,
or it maybe be genuine and you do get to stay in a apartment probably at double the cost it will cost you to stay in a hotel,time share has a bad press for one good reason most are tricksters,they will promise you a girl and a bike if you buy into there scam,