Based on the data provided, we can observe that the coin has had an average auction closing price of 133.93 euros in previous auctions. Additionally, the current condition of the coin is 70 (VF-), indicating that it is not in the best condition, but also not in the worst.

Considering that the coin will be auctioned in the coming days with a starting price of 30 euros, we can estimate a maximum purchase price based on the average auction closing price and the condition of the coin. Given that the condition is 70 (VF-), which is an acceptable but not excellent condition, and that the average auction closing price has been 133.93 euros, we could consider a maximum purchase price around 120-130 euros.

It is important to note that the final auction price may vary depending on the demand at that specific moment, so it is advisable to pay attention to the auction and adjust the offer accordingly.