I think that rent referrals is old and bad idea. Site can set attractive rules and lose money with every click or set good rules for site and than users are unhappy :-D Better is referral market like in adbtc where you can buy/sell your referrals and site have some fees from transactions. And everyone can be happy.
Its also a bit stupid i have been rented and renter payed 15k satoshis for me i already earned 45k satoshis for him and i will earn for 5 another days so he is good 30k satoshis plus another 5 days.I got just 5k as a sallary :/
you get money for nothing, in most of PTC sites you are rented and you get 0 for this, your income is from ads and this is just some bonus. But bad bonus for site owner - he must pay your clicks + return money to advertisers with profit + pay another profit you from rental + commisions. For example ads cost 100K satoshi but admin must pay 200K sats. Is just question how long can working this business model.