Amen do that! I would have never learned Photoshop or Dreamweaver without pirated software. This was me in college.
Doing that under your own company would be a bad thing to do. Don't risk it unless your using the software for personal education gain.
The upside to buying software as a student is that these companies sell them with a massive discount..or give them away for free. The downside being it's usually only for noncommercial usage.