Are academics attending conferences just for the sake of presenting papers, or are they looking for a plausible solution to their research?

In the last 10 years, there is a sudden surge in research papers from Asia (particularly from the region's largest few countries). The quantity is there but we do have questions on the quality and definitely the intent. With high volumes of submission, you would expect conference attendance to increase. Yet when the presentation comes, there are at least 30-50% absenteeism in the conferences where you receive high quantity of submissions. Thus, the question is asked if the attendance of such conferences is being used as just a tool for them to get their papers indexed or are they really using the tool to get answers?
So, the follow up question is if the indexing of papers is really useful, or it is a tool for the publishers to make financial gains?