I don't agree with this, and have an example.
When I was a member of the How Things Work Stack Exchange site, one particular user really wanted to reach 1K to be able to get the mod tools and become a pro-tem mod. Impressively, even with the rep cap he was able to reach 1K in (if I recall correctly) 5 days, the minimum possible earning 200 rep every day.
During the first few days of the site, as you said,
It is important [...] to obtain a good set quality questions and answers.
We're looking for quality, not quantity. Users should focus on good quality content, not lots of content.
Also, as I know from chat, the site you're referring to is a bit of an edge case. It has a lot more questions suddenly appearing than most betas do 2 days into them, and it has one extremely dedicated user who's trying to "catch them all"
Just my $0.02, downvote if you disagree or don't approve of my using the phrase "gotta catch 'em all"