Generally it's true conferences. Nevertheless, I think that it has the business character than for Science.
Similarly, many Journals reject papers directly from Editor, because it talks about new models and not new experimental data! they want to buy the maximum of papers, because new technologies need more data base for developing new generation and version of devices, techniques, etc...
I think these conferences are an opportunity for researchers and interested people to share their ideas and perspectives so as to benefit from the intellectual exchange that helps in making sound decisions