Possibly, it's a phenomenon in japan known as enjoukousai (en-joe-ko-sa-ee) or compensation dating. If your a cute japanese girl (and sometimes boy) you are often propositioned by older business type men to date with an extra incentive. It's like being a gold digger except its very up front.
The problem has been discussed many times and has become a real big issue in japan. Personally I believe it stems from the materilistic nature of the youth, and the aggressive branding, and exclusiveness in their popular culture. Most of the time these people use the money to buy Prada, Gucci, and Louis Vitton.
As far as initial D goes, Mogi very well might be. Sometimes (rarely) intercourse is not what you pay for. Sometimes t's like paying for a cute 17 year old escort.