Regarding the store, there are numerous keyboard specific outlets, why not use one/couple of them who stock exclusive GH merchandise like keycaps, tees, stickers, posters, etc. GH can then get a commission from those sales. There's plenty of enthusiastic members here to come up with at the very least one item every month. Members can make geekhack branded goods (Doesn't have to super flashy and always showing off the geekhack name, just something that GH will have rights to control sales) which the mods/admins/iMav will then give the go ahead and co-ordinate with their sales partner.
Just a thought.