To flat or not to flat

Since I started at my current job, I've been obsessed with flats. Mostly ballet flats. Strange because in my previous work life, I lived in heels. The higher the better. Then next thing I knew, I did a 180.

Joe Fresh ballet flats (my wannabe Repetto:p)

My sister will buy a top she loves in multiples. I do did (hopefully) the same with shoes. Same principle applies. If it looks good, feels comfortable, makes you happy, why not duplicate, triplicate it, no?