Near the beginning of a game night, a nervous guild member logs in and types
"/gu looking for healer for Shadow Labs run so I can get my Kara frag." There is silence for a bit, and finally the sole guild priest online says "I will grant you your wish. Some day, and that day may never come, I will call upon you to run my alt through Gnomeregan."
Guilds often revolve around the concept of "you scratch-a my back, I scratch-a yours." After all, that guildie that was there every time you needed an instance run for your Kara frags, whom are you to refuse the request when he or she needs a fifth for a heroic?
How much back-scratching do you in your guild? Are you more likely to help those whom have helped you, or are you ready to make anyone asking for help sleep with the fishes?