hmmm.... that's not how I remember things.
Please note that I didn't write that they gave all copies away. A lot depends on time and place. Here in Oz I've scored Visual Basic 3*, CorelDRAW! 8, Corel Word Perfect for Linux, NT 4 Server and a full Back Office Server for doing nothing other than turn up to a MS Tech Briefing. The samosas and coffee were free too. It's also worth noting that these were just the software; no documentation so benefiting Tim O'Reilly. For chump change, I scored Win95 including the Plus Pack, a Win95 T-shirt and silly hat, Small Business Server 4 and too much other stuff to mention.
Some of the freebies might seem a bit strange for MS to be giving away. These were from briefings given by Tech Pacific about MS corporate licensing. Very boring and irrelevant to my business of training computer users, but worth it for the freebies and excellent breakfast. And music. I first heard Portishead at one such bash.
* This was actually scored by a friend who went to a developer bash and given to the Gitling for his 9th birthday. By the time he wanted to learn C++, he was given an NFR of Visual Studio.