Unfortunately, there is no direct way of limiting snapshots report creation per Market. However, you can limit snapshots creation per salesperson(s) within a specific market.
Here is how;
Step 1: In the Partner Center, navigate to the Administration tab > Customize > Sales
Step 2: Under the Sales tab, click the 'limit monthly snapshot report' checkbox.
Step 3: An additional option will be displayed to set the 'snapshot creation limit' for the salespeople in the market.
Note: If multiple salespersons are working in a particular market, which is oftentimes the case, the Market limit will be the total allowable maximum that all the Salespeople in that market can create combined.