Selling etiquette

Also, is PayPal friends and family ok to accept from a buyer with a 100% score who's been around a while?

if they are the buyer and want to take a chance with friens and family thats on them.. as a buyer i never use friend and family. i'll pay the fee myself. its cheap insurance to me...

So, if someone has a low trading score( in the 70's) ,and most of their posts seem to be buying, and selling, and they ask about a postal MO, should I be concerned?

nothing wrong with a postal MO except the time it takes to receive. you never send the part until you cash the money order though.