Salary increases are frequently based on your existing base, so doubling salary in 1983 probably translates into an increased income stream since then, which would amount to a fair take (28 years of 100k income is $2.8 million).
Presumably there have been other stock options since.
If some of that income was saved and invested, there'd be some return on that as well. The Dow and NASDAQ are up about 1100% in this time (MSFT is up 29,900%). Interestingly, S&P 500 is up only 817% (greater diversification doesn't mean better returns).
As with most financial comparisons, there are a number of things to consider. On balance, selling his soul to MSFT in 1983 would probably have been the better move.
