Depends, if your buying them to use then keep in mind they are only good as a single speed as there is no reverse lockring. Also the axles are shorter so the overall spacing is 110mm vs the track standard of 120mm. No biggie, you can swap out axles but it’s a minor hassle.
That’s if you’re going to hang onto them.
It would certainly be worth paying up to $200 for the hubs if they match the cranks in colour. Apart from the pedals it’s almost a full set. I’d go for it and pimp them on US Ebay at the same time (probably separate auctions) and use the $'s to get some real track swag for the Bianchi.
Or keep them and build up a very pimp BMX.
Real value? Who knows … it’s only money.