Rumbo, I'm guessing it's not you who has driven the bidding price up to $350 USD already? Yikes.
Somebody wants that tool real bad.
Well, finally I won the auction, but it wasn't me who raised the price.
Initial price for the first tool in eBay was 25$, but this time the seller started with 99$. The action was this way: somebody raised the price to 150$ -something reasonable- but then other bidder come up and started bidding aggressively till reaching 345$. I raised just 5$ but it was my last trench and I thought I was going to be easily surpassed; eventually It didn't happen and I got the auction, first surprised was me.
I don't know why the other person was raising the price so heavily, maybe he read this thread here in Photrio and thought it was a collectible of value - this was the reason why I kept silence until the action was finished - or maybe he thought that the engraving was a proof of an original item and added value. Of course; I have some other theories as well, but at the end of the day it doesn't matter.
Regarding the tool itself, on one side it's way too much than I was considering to pay - and many other projects will have to be on standby by budgeting reasons. On the other side I can use the tool, and I think that one way or another it has a value in itself. and maybe I could consider the price just an "opportunity cost" for a scarce good;
Anyway,
@retina_restoration thank you for your support and for letting me know this second auction, and for you all thank you as well for sharing your ideas with me.