2,000 or 3,000 visitors per day are easily possible with pinterest.
You will need a couple of viral pins (meaning 10k repins) then...and getting these will be hard work. But once you get them there is basically nothing you need to do. I got two pins with each 10k repins almost 2 years old, that still send daily traffic (about 200 each). Ever since the algo change getting new viral pins got harder, but not impossible.
You won't achieve that kind of traffic with a simple follow/unfollow strategy, though ;-)