Why wouldn't your comments get endorsed and be seen as much as anyone else's?
Have you perhaps misunderstood the karma restriction to mean that people with less karma will have their comments be less visible? That's not the idea.
The problem isn't that I think my comments won't be endorsed. It's more I'll self censor my comments that I think would be less popular because I'd be afraid if I'm censored I wouldn't have a chance to join in future conversations until someone would agree with me.
If I release more popular opinions by the majority I'll be instantly accepted and have a chance to further join in conversations. From a gaming perspective the correct choice to better adapt to the system would be for me to always speak to the majority to increase my odds of being accepted until I am part of the elite caste of folks who can vote.
You're missing two important facts: first, that your pending comment eventually (after 24 hours) expires of its own accord, and second, that you can always delete the comment if it's taking too long and holding you up on a better comment you could have written.
In reading a thread (say, over the course of 5-15 minutes), I will often want to post comments at various points. Because I am not in a popular HN timezone, if I needed to wait for comments to be endorsed, I would find this seriously frustrating. Waiting and checking to see if a comment had been approved would be a huge time sink.
Edit: I think that limit has been lifted to five now.
Have you perhaps misunderstood the karma restriction to mean that people with less karma will have their comments be less visible? That's not the idea.