I scavenged some semiconductors out of an electronic fluorescent lamp ballast. They were marked, so I was able to look up the datasheets. A couple of the parts were BJT switching transistors with a 700 Vces breakdown and 400 Vceo sustaining. Digikey stocks them for $1.10.
The BSIDE and the Peak told me a bit about them, but mostly just that they still appeared functional.
I happen to think it might be useful to be able to measure more datasheet parameters than the BSIDE or Peak can. And I don't want an analog curve tracer. I want to put a part in a fixture, close the lid, generate a datasheet for it, put it in a numbered bag and add it to a parameter searchable inventory even if it is a house marked part. And not spend $20k+ for being able to do that.