using a VPN ultimately consists in trusting the company providing the VPN service that it won't be fucking around with your privacy. Considering that all your traffic goes through it, that's a lot of trust to place in one company.
Is that any different than the trust we place in our ISPs?
I agree with you. I fully expect my ISP/VPN provider to sell my traffic data, but I don't see the value in paying a VPN do to it.