Based on the provided data, we can observe that the coin in question has had a starting price in the current auction of 9 euros, with a grade of 30 (BC+). Additionally, it has been auctioned in the past on several occasions, with closing prices ranging between 27 and 160 euros.

The average closing price of this coin in previous auctions has been 65.6 euros, with an average starting price of 40 euros. We can also see that it has had estimated prices in previous auctions ranging from 30 to 200 euros.

Given that the current grade of the coin is 30 (BC+), and considering the previous closing prices as well as the current starting price, we could estimate a maximum purchase price of around 70-80 euros for this coin in the current auction. It is important to note that factors such as demand at the time of the auction and competition from other bidders can influence the final closing price.