and how profitable it is.
I am just afraid, this is how people are thinking and depending on others about their profit levels. The profit level of any business is truly dependent on our efforts. No service provider could be sure about how much we could earn.
Typically for PTC business, we must need intensive promotions in initial days like attractive pay per click rates and cheaper membership packages. For this we must need decent capital to start with.
Sorry for any probable off topic, still I want to suggest people go for PTC business as it it is one of long-running industry (more than a decade PTC/GPT sites are running) but you must need some basic idea about running an online business and do not ask OP like how secure you will be with this business.