[falcolas]

Well, it will stop your local ISP. It does nothing to stop the ISP servicing your VPN provider from snooping on your web activity.

Oh, not to mention the possibility of them blocking well known VPNs "to prevent piracy." Many open WiFi providers already do this.

[Veratyr]

Generally VPN providers don't use residential ISPs, they buy transit from a transit provider. I can't remember ever hearing of a transit agreement that permits the transit provider to sell connection information.