The few times I've managed to catch a listing for this book on ebay...it's been consistantly selling for between $50-75.
What the book is worth -what people are willing to pay for it! I don't know how many copies were printed (or reprinted) before it went OOP. Personally, I wouldn't pay that much for this book...I don't think it's scarce or rare. $30-$60 is a fair price according to condition. Yuri's copy is in good condition - but for the highlighting. Still, he could get a higher range, fair price if he decided to sell it.
Another website to check on this book and others is
www.abebooks.com . I just checked there but don't have time to peruse all the listings. There are plenty of copies of, "I wish you good spaces..." beginning at $1.61.
Ok I did look at the listings and saw Gabiou's book listed for between $59.95 and $150 -this one includes a 'recent' signed color photo. The book is indicated as being a 1st edition. This really doesn't add to the value of the book unless there is more than one printing. And sometimes, it's other printings that are worth more if say, there was additional text or photos added. Many things that can affect the value.
If I was going to spend the $$$ -I would buy 2 copies. I would by a "reading" copy and than another in vg-fine condition to "save"
.