I full heartedly trust .ca users. Mainly for the fact that i am one of few that actually use my country TLD. Look at me, i'm not a scam.

As for others such as cjb.net, .tk, .us etc. I don't really think too high of them, but it all depends on the web presence and product. If a .us or .tk site looks good and offers a good product sure i'll do business with them, but if the site looks dodgey and so does the domain i definitely won't do business.