Not to burst your ego (like I even
could 
), but..... "most collectors" don't know you guys from Adam. Just like they don't know *ANY* authenticator. But they put their money on the generally accepted belief (hope) that a TPA knows what they are doing. (Which feeds the scammers that have pretty holograms and websites).
Put another way: Let's say you are a seller of precious metals. You are a good merchant, possibly even the best. You always give your customers a fair price and good quality. But you measure gold composition in stinsons instead of karats. Your stinson may be
identical to karats. Those who have done business with you, love your service and price. However, when they try to resell, they're going to have a hard time selling an 18 stinson gold chain without having to convert it to karats. For those in the know, easy sell. For the vast majority...not so much.
Disclaimer: I have not had any dealings with anyone mentioned thus far, including ANY TPA.