If we're talking the Larry Page scale, well, Marc Andreessen posts here often enough to have noticed Maciej Ceglowski's Co-Prosperity Cloud; he saw a comment I left about a $50 follow-on investment and matched it.
How successful? Depends on your perspective. I thought I had relatives who I would classify as "extremely successful" and "rich", and they sold their companies for... high 5 figures. :) I must admit, my vision gets a bit blurry when it comes to distinguishing between numbers with 8+ figures...
https://news.ycombinator.com/submitted?id=picnichouse
However they were not well received (as has been discussed in a couple other threads)
While it would be entertaining to see them posting here, a Reddit AMA is probably a better forum.
Early in the product/company building stage you need to be doing lot of development (assuming you are a tech co-founder), but as company grow, most likely your profile is going to grow as well and now you are not developing anymore (or at least not so often). And hence there is much lesser need to be on dev/hacker network. Now they have team of devs, and I am they are here, contributing.