Made the edits you've suggested and a few more. Thanks!
That said (and I think we agree on this), it doesn't invalidate my argument (see http://en.wikipedia.org/wiki/Tu_quoque). The grammatical mistakes I made did distract from the point I was making (ironically demonstrating it all too well).
It also wouldn't be good use of my (or my friends') resources to ask others to proofread an HN comment :-)
"your advise" -> "advice"
"proof read" -> "proofread"
"invest" -> "invested"
Misplaced comma, missing "a" and "the" in a few places, awkward wording, unusual omitted/implied words...
I don't disagree with the content, but what's that saying? "Take the log out of your own eye first?"