Some companies spend a lot of money on advertising to promote their promote or service. Others products and services do not need to spend much money on advertising or marketing since they fulfil the market need and there is not much competition.
The amount celebrities are paid for endorsing various products depends on the media coverage they get and also the type of coverage. If a sports person starts losing matches or has personal problems, the sponsors do not renew their contracts and in some cases even terminate the contract early as it adversely affects the image of the company and product.
Many work at home opportunities involve marketing products which are usually purchased by women - like cosmetics, perfumes, soaps, cleaners, jewelry, candles and other home products. Women can sell these products to their friends, relatives and neighbours.