Since the industry doesn't use Gimp, those students would be putting themselves out of the market.
"It's the same argument for Microsoft and Windows. Pirated version of Windows increase the install-base for Windows. If those same people said "fuck it" and used Linux (or something else) instead of pirated Windows, then Microsoft would have less marketshare (and mindshare)."
This idea may work with a handful of apps. It doesn't work with the mid-sized software company trying to make a profit.