I have been one of the small inventors who wrote patents and ultimately sold them to a company that makes most of its money suing over patents.

Patents are a form of business insurance you can get on expensive R&D work. When you go into the market to sell your products, your marketing material and the function of your product naturally leaks how it works. Motivated competitors can then reverse-engineer what you did or otherwise figure out how to enter the market that you revealed was valuable. If they do it by actually out-innovating you, your patents don't really protect you, but if they just take what you're doing, the patent is there so you can claim the fruits of your labor regardless. In general, you cash in on this insurance contract by either contracting with lawyers to sue the infringers (usually on contingency or with litigation financing to remove the cash cost) or by selling your patent portfolio to someone who will sue the infringers.

In return for this insurance contract, you have to publicly disclose the details of your inventions in a way that a motivated party can read and understand (it's patentese, not English, but you can decipher it if you know the language). It also frees you up to publish internal details through other fora like scientific journals because this disclosure becomes pure upside (raising your company's reputation) rather than making you balance that upside against the downside of revealing information. Google is a good example of a firm that does a lot of balancing there: they publish a lot of their old, antiquated work while keeping the new stuff secret because it's mostly software and software is mostly unpatentable. In electrical engineering, small companies are much more likely to publish a lot more details on their newest devices because their devices are usually patented.

On HN, people mostly think about software patents. Many of these are stupid patents, and almost all of them have been invalidated through a decision called Alice Corp. vs CLS Bank. The digital shopping cart is one of these patents that Alice invalidated. By value, most patent litigation is about drugs, and after that you have things like computer hardware. The patent system really isn't for the HN crowd, and it really doesn't make sense for these software patents to be a thing - there's usually no expensive R&D to insure, and you have to write your patent before finding out if you have PMF.