How is it possible you can trust someone you have not done business with?
This is very possible, not only until you have a financial deal with someone before you can trust them, you can also find other reasons like seeing a member being reputable and consistence in his way of quality post and you draw a conclusion on that by trusting him, after you several years of experience about his consistency in what he delivers, we all know that there are some members here in this world on that we don't have to doubt their reputation than to just trust them if we wanted to even when we never have a transaction with them before.