Based on the data provided, we can observe that the coin in question has had an average auction closing price of 46.07 euros in previous auctions. Additionally, its current condition is estimated at 80 (MBC+).

Considering that the starting price for the next auction is 30 euros and that the condition of the coin is quite good (80), we could estimate a maximum purchase price around 50-55 euros. This estimation is based on the fact that the average auction closing price in previous auctions has been 46.07 euros and that the current condition is relatively high.

It is important to note that the final auction price may vary depending on the demand at that specific moment, so it is advisable to pay attention to the auction in order to adjust the offer accordingly.