To estimate a maximum purchase price for the coin in question, we can analyze several factors based on the provided data:

1. Current Condition: The coin has a condition rating of 80 (MBC+), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Prices:
- The average hammer price in previous auctions is 182.22 euros, suggesting that, on average, coins of this reference have reached prices above their starting price.
- In previous auctions, hammer prices have varied, but there are examples of sales reaching up to 220 euros, indicating a potential for high demand.

3. Starting Price: The current starting price is 150 euros. This is an important benchmark, as starting prices are usually lower than hammer prices.

4. Sales Trends: Since this coin has sold every time it has been auctioned (10 out of 10), this indicates strong demand and consistent interest in the coin.

5. Comparison with Average Prices: The average starting price of 79.44 euros and the average hammer price of 182.22 euros suggest that the coin has good potential for appreciation.

Based on these factors, an estimated maximum purchase price could be in the range of 200 to 220 euros, considering that the condition is good and there is a history of sales in that range. Therefore, a reasonable maximum purchase price could be 210 euros.