Why do ptc sites always do it?

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Hi all, Well, as much as i hate plenty of ptc sites out there as many of them are scam sites and many pay hardly anything, there are a couple that aren't that bad. I have noticed recently that i have been able to get a few 0.010 advertisements from neobux lately, which is great compared to the many cray 0.001 they offer. Anyway, what does get frustrating is the fact that i have noticed many ptc sites can either pay a lot per advertisement, or they will give you a load of adverts, or if you are lucky you get a load of adverts to click on aswel as them all paying highly. However, as time passes on and you get closer to your cashout amount i have noticed that many ptc sites start to either change the am0ount they pay per advert and offer a massive reduced amount, or/and they tend to send you far less advertisements per day. This therefore results in it taking us much longer than we anticipated to get to our cashout amount. Why do they do it? It certainly is like this as i have noticed that as soon as i have cashed out and restarted taking advertisements again, as my balance is now $0.00 i tend to get higher paid adverts and many of them, i guess they just really enjoy slowing us down. But no matter what we do still stay with them don't we?