How is selling a same product, to already willing to buy customer, is not profittable? Increasing the sales by several percent without any extra expenses is ce

How is selling a same product, to already willing to buy customer, is not profittable? Increasing the sales by several percent without any extra expenses is certainly profitable. To sell alcohol to kids, they do not need to invent new 'kid friendly bottles' and dump millions into 'kid oriented marketing', they are already here to buy, just sell the damn same product and here is the profit.