Hi Daniel
You're welcome. Think of commenting this way - are you adding something useful to the conversation by way of reaction or information? Just typing something inane like "Great Site, thanks - my blog has information about XYZ" followed by a URL, will see you deleted from most well run blogs very quickly.
There has been a very interesting discussion recently over at this blog about
comment etiquette and spam if you want to know more about some blogger's views on acceptable/unacceptable behavior.
Of course, it's all a matter of opinion
but a sensible approach will benefit you, whereas ultimately, a selfish one, will get you nowhere.
Mo