Wow I didn't know that there were even that many legit PTCs left. People making big money are mostly from GPT activity not PTC as most PTCs out there now are ponzi schemes that control your earnings through expensive upgrades and bots....... the money to be made is from GPT activity mostly not from struggling with fraudulent bots and wasting money on investment ponzi.
I am on 2 PTCs......One is neobux that EVERYONE here all knows, member since sept 2009, and Clixsense, member since oct 2011.....
I was a member of several GPTs but I am mostly active in CS since I make the most here, the pay rate is great here. On neobux I earn money now with $0 investment......My referrals are FREE, and paid for using the tons of neopoints I make, and earn from some mini jobs and frequent winnings in adprize. My biggest earner is ClixSense of course.......but since I am not investing money in any other PTC, any bit of income helps.
The only bux site I joined after neo was ONBUX, luckily I made my ROI before the scam artist stopped paying, ever since, no more bux sites because they are all ponzi and fraudulent by nature....except buxhost of course, where you rent real people, but there again, most sites scam quickly........
I'm sure you wouldn't be making $600+ from renting of referrals on PTCs, unless the site is brand new, this is usually when the admins give you lots of money through bots, then they close after a few months....