Based on the data provided, we can observe that the coin in question has had an average auction closing price of 65.71 euros in previous auctions. Additionally, its current condition is 70 (VF+), indicating that it is in an acceptable but not excellent condition.

Considering the previous prices of this coin, as well as its current condition, we can estimate a maximum purchase price. Given that the highest estimated price in previous auctions was 100 euros and the current condition is 70, we could consider a maximum purchase price around 90-95 euros.

However, please note that the starting price in this auction is 30 euros, so the final closing price may be lower than the aforementioned estimate. Therefore, I would recommend setting a purchase limit around 80-85 euros to ensure you get a good price in case there is not much competition in the auction.