"Most of the, maybe not so nice, responses to new posters has to do with starting a new thread that apears to be an advertisement for a restaurant or product. Sometimes it is in response to starting a thread with a real general question like "how do you like your hot dog?" by a 1st. time poster. "

I think PapaJoe has summed it up very well. These people either tend to be advertising, or are simple pot-stirrers.