[runsfromfire]

The pricing restriction is only for selling steam keys on external services. So if your game is priced at $15 on steam, you can’t sell steam keys on the Humble Bundle store for $12. You can match sales within 30 days, they don’t need to be concurrent - so if your game is on sale on Steam for $10, you can offer the same discount on the Humble Store any time within 30 days before/after the sale.

If you sell your game on other platforms and don’t use steam keys (e.g. distribute it DRM-free on GOG), you aren’t bound to the pricing clause. It only applies if you’re generating the keys on steam to sell elsewhere. You’re welcome to give your game away on GOG and still charge $50 on Steam, as long as you’re not giving away steam keys for your game on GOG.