A ratio that really matters depending on the product is how many monthly, monthly active users you have. If people use your product more, that generally indicates product market fit. Make sure you're not a you don't motivate your team too much and put them on tilt to do thing unnatural,. i think it's important.
Jason does a Founder University segment on how to generate startup ideas (1:55), then Zach Coelius joins to take some "Ask an Angel" questions: what data points are most valuable when iterating on product (29:03), what skills are most important to be a success in VC (36:410), what skills are most important to be a success in VC (42:51).