Ask HN: Is it normal to have 0 signups from tech journalists?

I've sent concise pitches about my startup (general, and for various features) to around 20 tech journalists from a couple of tech blogs/sites (mashable, techcrunch, tnw, rrw, lifhacker, venturebeat, etc.), both to their own emails and to the designated pitch email. I got 0 signups, and just one reply (after I repeated a previous pitch due to suspicion that my mails may be treated as spam). Note that I haven't contacted random people - I have selected them based on the articles they have written, which were on a similar topic to my startup. And I have pitched them at different times, a couple of them for each new feature (not 1 email to all of them at the same time)

Two questions:

1. Is this the regular case? My expectations were that they would decide not to write about something after they've seen it in action. My homepage (http://welshare.com) is not so repulsive and lame. One option is that they decided based on the list of features, which does not require registration, but I would still signup to see how it actually works.

2. Should I continue sending pitches about new functionality? I've read a couple of times that you should send pitches as often as possible, but this sounds a bit rude: sending similar information over and over to the same people until you 'break their defense'. I'm constantly looking for new people to send pitches.

Thanks in advance.