This has happened to me on a forum before when I got more than 25 referrals in which only 2 of them were active. So if I was to buy the referrals then it means that I would have wasted my money on them.It will be impossible to get referrals that make posts as per our requirements and what if they are banned for copy paste or for some other reason so its hard to buy active referrals and it may result in money and time waste if we indulge in it