I like it, I think the singular is far stronger than the plural as it has more potential uses, ie it could be used for a website all about charitable giving or donating (ie any instance where 'give away' refers to the act of giving) as well as being used as a noun (ie a giveaway or freebie)
Re the value, it's whether it suits someone's purpose and how much they want it, they might be lucky and get high £xxx or low £xxxx to the right person though it's possibly a bit of a waiting game.