At the end of the day it is to you to use your ST as you want, within the rules of the club (so selling it on is a no no, and is effectively stealing for the club you are supposed to love and support!)

In my opinion this is how I think a ST should work:-

Once purchased if you cannot attend then pass it on to a friend/relative/acquaintance for no charge or donate your seat back to the club so they may make a little more money from selling it for those particular matches.

This benefits the club and you are not out of pocket, so where is the harm? Your incentive should be the knowledge you are doing as much as you can to support Hibs, whether it be from attending and getting behind the team or by allowing the club to financially benefit and equally allow another to physically get behind the team on the terraces.