Answer: To advance a company, make more money/product, and/or organize better.
Explanation: If a company needs a better marketing plan, it’s generally because they want to make more money, attract more customers. They hire somebody to create a new layout for a store (which is organized based on how the human brain works), which generally leads to more merchandise- you spend money to make more money. Cost and price are two very different things; a company can buy a 2 cents, and charge $3 for it, making good cash.
If a company is making a plan, they’re wanting to advertise. Maybe they’re just starting up, or want even more customers.