For what it's worth, I've upvoted this too. I certainly didn't mean to kill the trend completely (which is what seems to have happened :-/). There is some obvious value to it. I wouldn't want to see the Offer HN thing become a lasting trend at the current levels... that said, the odd "Offer HN" doesn't bother me, and I certainly wouldn't want to think that all offers stopped completely just because my post got upvote…
I got a bunch of questions and emails (around 250 and they're still coming in) - all they ask for is tips and tricks, maybe some ideas on how to further expand their presence on the webz.
I don't ask for anything in return, I don't promote products, I don't promote services - just plain old "This is your site. These are the flaws - this is why it's called a flaw, and here's how to fix it".
I once wrote: "I'm really interested in your project. Here's my personal email. Email me and we can discuss a possible investment on my part."
Crappy SEO, but the product was incredible.
Back on track;
I created a special email address just to accept HN questions.
But I do see it from your POV. Many entrepreneurs I know have lost a lot of money via the "I do something free for you - but you have to buy something from me in return"-scheme.