5 to 20 times as much per visitor. So for every $1,000 you make now you would have made between $5,000 and $20,000 then. Also for the little guy it was easier to obtain traffic. So for most double or triple that again to get a general idea.
Bottom line: $1000 now = $10,000 - $60,000 then
But most of us were incredibly lazy in those times as we've all admitted. ;)