Based on the data provided, we can observe that the coin in question has had varying starting and final prices in previous auctions. The current condition of the coin is estimated at 30 (BC+), indicating that it is not in the best condition, but also not in the worst.

Taking into account the previous prices of this coin in past auctions, as well as its current condition, we can estimate a maximum purchase price. Given that the average final price has been 32.5 euros and the current condition is 30 (BC+), we could consider an estimated maximum purchase price around 35-40 euros.

It is important to note that the starting price in this auction is 12 euros, so the final auction price may end up above this value. However, considering the historical data and the current condition, a maximum purchase price of around 35-40 euros could be a reasonable estimate.