If anyone is interested, the link to the full chapter is here The challenge, which I liked the sound of boils down to this.

1) This is Buffy the Vampire Slayer
2) A genie (specifically the one from the disney aladdin movie) is going to grant xander three wishes. No monkey's paw, no twisting, no cheap shots, this is a genie that honestly wants to grant his wishes in the most generous way possible.
3) He was given a list of potential wishes that dont directly benefit xander, though none are selfish (things like world peace for example) and his job is to interpret three of these wishes in ways that are directly in xanders favor.
4) Give us some wishes that could be twisted from unselfish help the world types to ones that directly benefit xander and also create an interesting story idea.

Im going to give a random example. Lets say one of the wishes was, "I wish the world had a source of safe, unlimited, clean energy it could use for everything" Granted. Now Xander is able to start up a stark industry style company, there is a solid base in fanon he can work with, with this idea for said clean energy. He is now able to become rich and powerful while helping save the world. it could make for an interesting story simply because of Wolfram and Hart, the evil demon run law firm, causing his new company issues from legal to demonic assassination squad types, and could easily be turned into a crossover if you wanted.

Thats the challenge in a nutshell, come up with unselfish wishes that can be turned into a cool story idea for BTVS.