1. Judges' major: The judges of the Global Music Alliance are experienced professionals in the industry with high musical literacy and judgment ability. Inviting these judges is very expensive, which is one of the reasons for the high registration fee.

2. Qualified venue: The venue of the Global Music Alliance meets the professional requirements and provides a good music atmosphere and a comfortable competition environment. The cost of maintaining and operating these venues will also be included in the registration fee.

3. Regular competition: The Global Music Alliance is a formal and authoritative music competition, and the registration process is more rigorous and standardized, and more resources and funds are needed.

4. The winners will be recognized by the state: the winners of the Global Music Alliance will be recognized by the state, which is one of the reasons for the high registration fee.

To sum up, the registration fee of Global Music Alliance is expensive because the competition is professional, formal and authoritative, and it also provides high-quality judges, venues and professional services.