Ptc websites how they earn?

Hello i saw allot of ptc websites but i cant find where they do earn here
lets say
you buy in 200$ 200 refs those 200 refs click lets say 5 ads per day
so 200x0.05 = 10$ Daily and that's 300$ monthly now the admin earned 200$ and he needs to pay you 300$ please explain to me ?

hooler said:

this is lame discussion, not a real webmaster deal, but anyway, when those 200 people click, they create "traffic" and webmaster can also sell that "traffic".

Click to expand...

those 200 users make about 1000 clicks that worth 10$ this what u call money ? still any1 can answer for my question with numbers?
and most ptc got there own ads :X

any1? 1