Based on the data provided, we can observe that the coin in question has had an average auction closing price of 83.24 euros in previous auctions. Additionally, its current condition is 80 (VF+).

Considering that the starting price in the upcoming auction is 30 euros and that the coin has performed well in previous auctions, we could estimate a maximum purchase price around 100-110 euros. This is because the coin has had closing prices above 100 euros on several occasions and its condition is quite good.

It is important to consider that the final auction price will depend on various factors, such as demand at that specific moment, the number of interested parties, and the competition in the bidding.