Very true in this hobby. This is what I tell every single person I know who starts smoking cigars as a hobby:
1. Figure out how many cigars you smoke, on average, a month. For example if a person smokes two cigars a week that's eight cigars a month.
2. Take your monthly number and multiple by 10. In this case it's 80.
3. Round to the nearest 50/100/150/200/etc. In this case 100.
4. Multiply by 2. In this case it's 200.
Now, go buy a humidor that is "built" to hold 200 cigars, because realistically it will only hold about 125-135 depending on the ring gauge/spacing/dividers/etc. Overall, I find this to be ideal because there is enough % to go around for random cigars, regular smokes, and rare smokes. You also have some room for cigars that are resting or even aging.