Can we have trust in the network of travelers to be couriers?

I have successfully used www.chakkr.com to deliver my courier needs faster,reliable and cheaper. Infact I met the person who offered me courier service and only i when i felt i can trust the person, i accepted to make use of his services. Read my blog to know my experiences: www.seema-musings.blogspot.com/2009/10/im-chakkr-courier-wheel.html Yet I really wonder if such network of travelers to be couriers can be relied upon? Do you think a complete stranger can be courier of our courier needs? Regards, Seema