Thanks for the explanation. But if I'll ask my friends to join then they are going to be inactive as well and my friendship will be on stake. Tell me how much can I earn without having any referrals. Can I still be able to pay for VPS from that earning (like You).?
That depends on how many ads you got. The ads are country specific, US people will get a lot more than others as usual, I only got 4 per day, sometimes up to 5 - 6, so the least you can earn on any day is $0.04.
The goal is to spread the link in any way possible, but not make it look like spam. If you make it look like spam you are surely gonna get a bad reputation, but if you describe the service, and explain as I do, it is more likely that you gonna get referrals. I only got 1 of my real life friends to sign up, he clicked a couple of hundreds ads then got enough. That's mostly because my friends aren't interested in the internet as I do, with hosting at all. They buy expensive stuff and then PTC's is not a good option to earn money if you don't want to spend hours of work.
Most of my referrals are people I don't even know. I only know one of my referrals, and that is TechAsh. The rest is people who saw my link on a forum or searched on bing for neobux (my link was #1 in the bing search results for neobux for a couple of months)