From 2012-2014, YC companies received an automatic $85K follow-on investment from a syndicate of investors, though this was not funded by YC. From 2011-2012, they received an automatic $150K from Yuri Milner. From 2005-2011, it was $6K/founder (I think very early on, it was a flat $20K). So YC's capital expended has been a lot less over time than the current deal would reflect.
https://blog.ycombinator.com/the-new-deal
From 2012-2014, YC companies received an automatic $85K follow-on investment from a syndicate of investors, though this was not funded by YC. From 2011-2012, they received an automatic $150K from Yuri Milner. From 2005-2011, it was $6K/founder (I think very early on, it was a flat $20K). So YC's capital expended has been a lot less over time than the current deal would reflect.