Based on the data provided, we can observe that the coin in question has had an average auction closing price of 57.56 euros in previous auctions. Additionally, its current condition is estimated at 80 (VF+).

Considering that the starting price for the upcoming auction is 30 euros and the historical average closing price is 57.56 euros, we could estimate a maximum purchase price around 60-65 euros. However, please note that this is just an estimate and the final price may vary depending on demand at the auction and other external factors.