The business model of SO as a company is structured in such a way that it'sits income isn't correlated with reputation, so you cannot attach a monetary value to reputation.
SO has two main ways of making money, the. The first is ads. The income money SE gets from ads is going to loosely correlate to the amount of views on the site (particularly from anonymous users). Views however, particularly views from anonymous users, isn't going to correlate to reputation. Lots of actions will earn people lots of reputation, while keeping a fairly low anonymous user count, while other posts will get enormous numbers of views, particularly views from anonymous users, without earning the site as much rep (proportionally). This is in large part because anonymous users can't vote, so their views don't generate rep.
Next there's the Jobs portion of the site, that. That generates money by matching people looking for jobs with people looking to hire. There's even less correlation here between the revenue generated and rep increases in the site, mostly as a result of the fact that such a small portion of the site's users actually use this feature of the site, but also because usage rates aren't going to correlate with the user's rep (if you only count "active" users).