Every time you look for a new customer, you will have to pursue at least 10 others (assuming a 10% conversion rate). The number usually will be anywhere upwards. Think of the cost involved. And the effort.

Every time you speak with a 100 people, you will have to tailor your messaging in multiple ways (depending on the segment). Also, since marketing isn’t like STEM with precise equations to get to an answer, there will be a lot of hit-and-miss action. Again, multiplied effort. And cost.
You spent a fair amount of resources to convince a person to buy a product in your category.