If you have a business account, you'll be able to track your pins performance and decide how things are working for you. So categorized them, i.e. groupboards vs. non-group, your domain vs. others, manual vs scheduled, etc.
When it comes to pins/day, you don't want to go overboard. It's annoying to get banned and not knowing whether or not you'll get reinstated weeks/months down the road. So it's better to save 0-5 pins / board / day to err on the side of caution. Meaning, it's good to have multiple boards of relatively same niche and many different pins to work with if you want to pin a lot/day.