For those of you who like to travel via Greyhound, here is a gentle word of warning: Greyhound's policy is to charge a 15% penalty if you attempt to cash-in any unused tickets.
I've been travelling Greyhound for 25 years now, and this is the first I've heard of this. It's a nice little racket--for every 7 refunds, they make the equivalent of a full fare, and have to provide absolutely NO service, to boot.
Ian H