PIA state they don’t keep logs on their servers, they can’t provide those guarantees on the network as they don’t run the networks they operate on.
Plus colo and transit costs more than paying for a slice of resource someone else is already hosting, so there goes that price model.
Hey PIA, mind if I throw my little server in your datacenter? No you can't access it though. I promise it'll be properly secured! Hey! Why are you walking away?
I'm not sure what point you're making about colo and transit costs. Are you saying that operating your own has higher costs? Or that a commercial VPN provider has higher costs? I'd be very interested in a price analysis that beats PIA while offering a remotely similar security profile. Keeping an RPi at your house provides defense against totally different threats.
Do you have a source on this?