Not only does it reset per quarter, it is per product as well.
If a company was gaming this pricing creating 100 products each earning $4,000 (vs. $400k) they are saving $15,000 and are likely to hurt their business via customer confusion.
Other than the particularly small scale operations (someone's side project, etc.) if the product hasn't hit $3000 revenue in its lifetime, even small/medium sized business would be fairly troubled in the standpoint of sustainability.
"6. Records and Audits
You agree to keep accurate books and records related to your development, manufacture, Distribution, and sale of Products and related revenue. Epic may conduct reasonable audits of those books and records. Audits will be conducted during business hours on reasonable prior notice to you. Epic will bear the costs of audits unless the results show a shortfall in payments in excess of 5% during the period audited, in which case you will be responsible for the cost of the audit."