The common rule around here is to charge more. This is also promoted a lot by patio11 on HN and on Twitter. I would counter this with the fact that sometimes it could backfire. Just like in a job negotiation, a contract negotiation might end up with no contract at all. So while it's nice to hear about this, applying it in practice generally works for new customers while the original/current customers are paying your…
Well yeah, especially when you consider that the people writing those things have no way to know if you should charge more or not. It's actually pretty silly to respond to someone on HN and pretend you know that they should charge more. This is one of those situations where free advice is worth what you pay for it.