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

1. Current Condition: The coin has a condition of 80 (MBC+), indicating that it is in relatively good shape. This suggests that its value should be above that of coins with lower conditions.

2. Previous Auction Prices: By looking at previous auction prices for coins with similar conditions, we can see that:
- In past auctions, coins with a condition of 80 have reached hammer prices of up to 210 euros (as seen in the auction on 2022-05-07).
- There is also a hammer price of 220 euros for a coin with unspecified condition, but which could be similar.

3. Average Hammer Price: The average hammer price for this coin is 162.07 euros, providing a good reference point.

4. Starting Price: The starting price is 90 euros, indicating that the seller expects a reasonable minimum price.

5. Sales Trends: The coin has been auctioned 32 times, of which 30 have been sold, indicating good demand.

Based on these factors, an estimated maximum purchase price could be in the range of 200 to 250 euros, considering that the condition is good and there are precedents for hammer prices in that range. Therefore, a reasonable maximum purchase price could be approximately 220 euros.