37signals, while being a good group of people, seem to have found success in a way that I'm not sure is as easy to repeat as some of those companies that just crank away doing their thing and making their money without needing a hugely followed blog, books, web frameworks and the like. This makes me a bit dubious of some of what they have to say.
That said, I've noticed some of the advice (mostly about marketing) doesn't really apply when you're just starting out.
I don't really see myself talking about revenue numbers for my company. Not sure how I benefit from it besides the ego and status boost which isn't interesting to me.
I think the lopsided press coverage of VC-backed vs. bootstrapped makes sense when you think about the incentives: VCs are focused on liquidity events (acquisition, IPO), so their startups might aim to be in the tech press and divulge details about revenue, growth, etc in an effort to pump up their valuations.
If you run a profitable bootstrapped company and you are reaching your customers, why speak to the tech press and discuss your financials? It would attract competition and I can't think of any upside.
I don't know about disclosing financial details, but the answer to the rest of your question is ego. Many people succumb easily to the desire for social recognition, even at the cost of strategic advantage.
Speaking from personal experience, it is sometimes difficult building a solid business that goes completely unrecognized outside of your own customers. It's a normal and accepted part of doing a boring business, but I can at least understand those who allocate resources to the pursuit of a little bit of ego gratification.
So, this lack of coverage should come as no surprise.
(I haven't seen Balsamiq post detailed revenue and their breakup lately.)
I would say do what feels comfortable to you. Most likely, it is to keep revenues etc. secret. Revealing those details might get some eyeballs in the short term but not customers.
If HN users aren't your customer base, then coverage in TC or HN frontpage will do nothing for you. It may stroke your ego, but it won't pad your pocketbook.