Referral limit in the PTC sites....

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Now most of the PTC sites have limited the number of direct referral that each type of members can have. But in practice, all of the ptc sites are looking for the member to register in their site.Even then they are not allowing us to have unlimited direct referrals. What is the reason for these restrictions? Is it to stop the payment to the members? First bux.gs allowed the members to have 2000 direct referrals and now it seems they are allowing only the 200 clicks in a day..Some of the PTC sites are now are not allowing us to delete our inactive referrals, without any fee. How do you feel about these sites ? Can we trust them?