Any person involved in any sort of business would know that, when selling to a limited range of customers, you will make way more profit by selling it at a lower price aslong as that price covers your expenses.
And I highly doubt BlueByte's expenses of providing a player with a virtual item in a virtual game would exceed 1/100£. Thus, if we assume the expense of such an item is 1/100£, BlueByte would make a profit worth 75000% the investment for each item sold.
And to think about all those people who are enraged about Apple who has a profit margin of close to 400% per iPhone sold to a retailer. And that only considers the cost of the material, thus doesn't include shipping, manufacturing, taxes, tolls etc.