The reason a Replay Gain standard is needed is explained in the Introduction. However, if you mean "Why have you bothered to do this?" the answer is because someone had to! I'm not expecting to gain anything from this proposal. I'll be happy (and quite surprised) if it's totally successful. However, it seems such an obvious idea, yet it's one that the audio industry has managed to overlook for 100 years.
You can find out more about me on my web site. You'll see I'm an audio nut who likes a challenge!