Diamond keys: selected 500-Lark price and awards

The selected playtest purchase is 500 Larks for one Diamond key, at most one purchase per UTC week, subject to the four-key bank target. The existing currency system handles the confirmed payment; this is not a live shop quote.

The benchmark is 1,200 Larks per work hour = 20 per minute. Thus 500 Larks represents 25 benchmark minutes. It is not passive income or a promise that every job pays that rate. This replaces the earlier 1,000-Lark candidate and five-hour pricing formula.

Also proposed: at most one event-earned Diamond key/week across sanctioned events, for a published completion objective with capacity reserved beforehand.

Two separate lifetime achievements each award one Diamond key: first full mastery of all eight skills at 99, and first completed prestige. They do not use the purchase/event allowances. Later prestiges do not automatically grant more Diamond keys.

No real-money purchase, bulk discount or extra opening fee. Earned and purchased keys use identical odds. Price/value still need playtesting against actual reward previews and voluntary demand.