QUOTE(kikikaki)

It is 10m start price in Auction.
Is it worth the price?
The same rapier was quoted not long ago in this thread at 10m to 15m. I agree with this quote, especially in a shop. In an auction it could go for less.
Rapiers used to be a lot more expensive just one year ago. For best class rapiers at 97%+ damage the price may still be the same. But below 90% they have dropped drastically.
It's surely a fair asking price. But is it worth it? Maybe not because 90% is 2m to 4m these days. I would bid 10m on it if I didn't already have an almost as good rapier.
Assuming you win that rapier, I recommend getting only But5 Fat4 to take maximum advantage of the high damage. The average cost for that is about 1.3m x 2 = 2.6m