Based on the provided data, we can observe that the coin in question has had an average auction closing price of 154.54 euros in previous auctions. Additionally, its current condition is estimated at 75 (VF).

Considering that the starting price for the upcoming auction is 30 euros and the historical average starting price is 66.25 euros, we can assume that the closing price could be above these values.

Given that the condition of the coin is 75 (VF), and considering that previous auctions have had closing prices significantly higher than the starting price, we could estimate a maximum purchase price around 180-200 euros for this coin in the next auction.

It is important to note that the final closing price may vary depending on factors such as demand at the auction and competition from other bidders interested in the coin.