Key principles on in-game virtual currencies | European Commission

Quoting someone from another site:

Some key things:

1. The real world price must be displayed for the item, not just the currency (ie, an outfit should say $24 next to it, not just 2800 vbucks).
2. Currencies must be exactly matchable to purchase amounts, so no 1000 point packages for 800 point items to leave 200 extra

It’s nice to see some government documents that genuinely understand how these currencies are being used in manipulative ways.