Trust is an extremely subjective concept that is hard to quantify. For example, to a brand new user, 5 vouches may seem very trusted if they are simply looking to purchase an upgrade from someone. However when I say I will not accept paypal from anyone who is not trusted, I typically mean 50+ vouches.
Point being, "trust" has different meanings for everyone, so it is up to each individual to gauge it for themselves. Hope that clears it up for you a little, however this is not really a feedback thread, if you think it is suggestion worth, feel free to offer it up there : )