Google has recently done an analysis of citation trends, and found that citations to "less" prestigious journals are actually increasing:
Rise of the Rest: The Growing Impact of Non-Elite Journals
An extract from the above study:
"... now that finding and reading relevant articles in non-elite journals is about as easy as finding and reading articles in elite journals, researchers are increasingly building on and citing work published everywhere. Considering citations to all articles, the percentage of citations to articles in non-elite journals went from 27% in 1995 to 47% in 2013. Six out of nine broad areas had at least 50% of citations going to articles published in non-elite journals in 2013."
Additionally, in my personal experience (15+ years of computer science research), I've found that the breadth of ideas is considerably enhanced if one makes some effort to go beyond the so-called "top" journals, while still staying aware of publications in "top" journals.
A lot of the elite-type publications can be quite political, in the sense that stuff won't get published in them (ie. get past the reviewers) unless it follows the fashionable-approach-of-the-day and cites the "right" papers. This can lead to a reduction of new ideas and/or only incremental improvements of existing methods.
As a consequence, some of the less "prestigious" journals can in fact be a breath of fresh air, where some of the more risky, newer, and/or alternative methods are explored.