PTC sites profitable?

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Hello, I am thinking of making a ptc site (buxhost) , but i want to know that is there any profit? Because i don't want to spend so much amount and not getting any profit. If i open any site, i'll be like legit, and not scam! And can a subscription in buxhost extended.? Like if i have a 6 months subscription and i'm like getting profit with the site, can i extend my subscription?