The level of income and position of a potential client is a very important factor. If you offer for example outsourcing of accounting to an office clerk, it is unlikely that you will achieve positive results. And if the advertising campaign is aimed at the Directors and owners of the company, it is likely to give an excellent result.
The level of income of a potential client must be known for the sale of a product. If you have a premium product, at an appropriate price, it will probably be difficult for you to sell it to a student who somehow pays for his studies. Conversely, people accustomed to the premium segment of the goods are likely not to buy economy class products.
Of course there are exceptions to the rule, but as a rule, this trend is always maintained.
The age of the client plays an important role in drawing up a portrait of the client.
Advertising message for different age groups should be different, as teenagers, for example, we can entice comics or superheroes or a new fashion movement.
People in age it is not wonder they have very different interests. They want more comfort, silence.