We recommend the followings to ensure that the AI applications is safe & ethical:

• Use a transparent and accountable AI development process. 
• Identify and mitigate potential biases in your AI algorithms.
• Explain how your AI algorithms make their decisions. 
• Protect the privacy of your users' data.
• Use security measures to protect your AI systems from hacking and other security threats. 
• Consider the ethical implications of your AI application before deploying it.

The potential revenue gains from using AI in your application will vary depending on the specific objective. However, AI has the potential to improve efficiency, accuracy, and customer satisfaction, which can all lead to increased overall revenue.

We believe the best practices for using AI technologies in application development include:

• Using a clear and concise problem statement.
• Collecting and preparing the right data.
• Choosing the right AI technology for the application.
• Training and evaluating the AI model.
• Deploying and monitoring the AI system.

The cost of developing an AI application will vary depending on the specific application. However, there are a number of factors that can affect the cost, including:

• The complexity of the application.
• The amount of data that is required.
• The expertise of the development team.
• The time to market.