I imagine if there were such a forum, it would not be public like this because membership would imply "I have money" and that makes people a target.
I think a better approach would be to join forums related to specific interests which aren't dependent upon "I have made it as an entrepreneur." An expensive hobby would likely surround you with other people in similar circumstances in terms of financial success, though they may not have made it as entrepreneurs.
I don't think it applies here because the focus is on making money and solving problems, not on "how can I spend my fortune?" However, that doesn't mean that some members don't get hassled. It's entirely possible they do but since I don't have money (I have nothing but debt and have said that repeatedly), I really am not someone who can say for sure if the folks who have made it get hassled by people who meet them through HN.
I think a better approach would be to join forums related to specific interests which aren't dependent upon "I have made it as an entrepreneur." An expensive hobby would likely surround you with other people in similar circumstances in terms of financial success, though they may not have made it as entrepreneurs.