No, I'm not being a grammar nazi, I'm just trying to reduce friction for readers. Those who don't know the difference won't notice, but those who do notice the difference will care, and will have a small "jar" of annoyance, sigh about illiteracy, and be distracted from the main point.
This isn't spam, where bad grammar is deliberate and acts as a filter to help focus on those more likely to be duped into clicking. This is submission to HN, where the purpose is to share knowledge with similarly-minded people.
Do you get your web sites proof-read? Do you use correct grammar and spelling on the pages intended to attract customers and sell product? Do you do everything you can to improve the experience of your visitors, to make their visit pleasant, annoyance-free, and funnel them into conversions?
Why should you treat your colleagues here on HN differently? Show them some respect, and pay attention to friction-free communication.
I do recognize that not everyone here is a native English speaker. For them I hold huge respect. Many times I've tried to communicate in a language not my own, and I have some insight into the size of the task. This is aimed firstly at people who don't seem to respect their audience enough to even try, and secondly to point out that small things like this might very easily have an effect on sales.
(Added in edit - probably according to someone-or-other's law there will be a grammatical or spelling error in this comment. If you had to hunt for it then you don't win, you're just missing the point. If you stumbled over it and it spoiled your flow, please let me know so I can fix it. Thanks.)
(Added in further edit - This comments has already had at least two up-votes and at least two down-votes. I don't care about the karma, but I do care about effective communication. Here's my opinion - instances of using "loose" instead of "lose" (to pick one common example) damage effective communication for some of your intended audience. If you don't care about that, fine. It is, however, information for you. If you want to shoot the messenger then feel free to down-vote.)