Do unto others... That's a good mantra. A good question is would I mind if someone did this to me? Before I bought the Saleae I did alot of research and I noticed the chinese knock offs which (in my opinion) unethically linked backed to Saleae's website to download the software.
There is a tremendous amount of R&D into a product like this, I've worked for a software dev shop before, it's really expensive. I've been really happy with the purchase, software is fantastic (and it works on linux!) and I get the warm fuzzy of supporting a U.S. company.