Based on the data provided, we can observe that the coin in question has had an average auction closing price of 106.71 euros in previous auctions. Additionally, its current condition is 75 (VF).

Considering that the starting price for the next auction is 30 euros and the estimated average closing price is 106.71 euros, we can assume that the closing price could be around that value or even higher, given that the coin has sold in 98% of previous auctions.

Given that the coin's condition is 75 (VF), and considering the previous prices of similar auctions as well as the increase in closing prices over time, we could estimate a maximum purchase price of around 120-130 euros for this coin in the next auction. It is important to note that this is just an estimate and the final price could vary depending on demand and other factors at the auction.