A couple of days after PTCBox died I faced the urge to reuse neobux.. but thankfully I didn't allow myself.
Any calculation I did with what they're offering led me to loss instead of profit. And I wasn't willing to invest a thousand to get ultimate and rent refs that are possibly bots..
As for direct referrals, limits don't count for me as I've been a member there since the beginning.. but still I consider it extremely expensive to get referrals for neobux nowadays so I looked away. Besides, I remembered that I've hated it for so long to suddenly like it again..
I used buxpal which fell into the same hole with PTCBox.. paypal limitation.
I joined ClixSense (i now wonder why I was never fond of it.. it would have been a great money maker if I had joined early)
but I had kind of a hard time to get referrals for it.
And then I found StillSleeping's ptc promising and decided to stick to that for now.
I've had a lot of support from him so far and feel good with the site.