Faster Google crawl rate does not help in ranking. John Muller has confirmed that on Twitter. He said there is no negative impact if you request Google to crawl your site. But also, there is no improvement in ranking if Google crawls the website more often.
A user asked a question.
Requesting Google to crawl your pages doesn’t negatively impact your rankings and if Google crawls your pages more often, it doesn’t improve your rankings.
John replied to his question.
No, it doesn’t hurt your rankings. Also “getting crawled more doesn’t positively change rankings either.”
Here is the Tweet.
@akinyemi_alamu No. However, getting crawled more doesn’t positively change rankings either.
— John Mueller (@JohnMu) November 1, 2016
So it is most likely an SEO myth in the market.