Fabulously, not as many. HP, Intel, Sun, SGI, Microsoft, Cisco, ... I mean all of these did leave people fabulously rich. So I'm not sure what you're talking about unless you mean the ZIRP IPOs of scam companies we've seen in the last fifteen years.

If anything, from 1970 to late 1997 you did have a few differences - the fraction of scams dumped at inflated valuations on the public markets was a lot lower, and the number of huge company exits was lower - but that's actually more about how the industry was healthier (less bullshit) and smaller (it hadn't grown yet).