100k income per year + 33% for employer taxes, medical/fringe benefits, etc, so 133k.
1.5 years of work at 133k/yr = ~200k payout.
I wouldn't call that low since it already hinges on massively inflated salaries due to massively inflated cost of living for developers in hubs.
That 100k of buying power in SF would come from about a 55-60k salary in my area. (1)
(1) http://www.wolframalpha.com/input/?i=moving+from+San+Francis...