I agree with you that you can use this thread in any way which is related to the service. But it's also true that this specific topic of yours has been broadly discussed so many times. You can just go back and see what users were asking and what PBMining answered. They are not going to disclose their business plan or any other information on their operation. That's it. It's your choice to decide whether you want to trust them and invest some money or whether you don't trust them and don't invest money.
I have almost 90 GHS with them. Am I sure this is not a scam? No, I am not. But I am willing to take the risk.
Are other services more reliable? Not really. As long as you have your bitcoins in the cloud, no service is reliable. Take CEX as an example. They seem to be more reliable but what prohibits them to just unplug everything tomorrow and keep your bitcoins? Nothing. Do you personally know them? Do you know where to sue them in case they take your bitcoins? No...it's basically the same exact risk you have with PBMining.
I'm sorry but trawling through 960 responses for a very specific point seems rather over zealous. Unlike many others I do not have unlimited time to read through what is mostly of uninformative substance.
Of course it's my choice - no one ever said it wasn't. Doesn't mean I am not allowed to ask for further information.
Cex is irrelevant - I have not mentioned Cex once. I am evaluating PBmining based on its merits and solely on its merits and not in comparison to any other site. And just for the record - to refute your final statement there is more risk if it can't be proved that mining is occurring.