I published an application in Azure, I created a resource group with a plan, which for example gave $ 50 / month.
Is this value independent of access quantities and traffic? If 1000 or 100000 user access per day, will the different amount come in the invoice?
Directly the number of users will not affect anything. What it affects is the traffic generated by them. So if 1 user traffic 1GB, this is what will affect. If 100,000 users traffic 1KB each, these users will consume far less traffic than that single user. It will depend on the use that each user can make in their specific application, security measures to avoid abuses (from attacks or excessive use), etc.
In general there is an average traffic that each user usually does in a session (which is another thing to analyze, after all if the same user accesses multiple times, it will probably generate more traffic than a user that only accesses once ) can be determined by analyzing the logs of access. You can make estimates by understanding the traffic pattern of each operation, the expected operations in each session, and the number of sessions / users that you should use. But only the actual use will give a real notion.
How much more expensive it will depend on your plan, but it will probably get more expensive yes. Including one of the usual attacks is to generate fictitious traffic to, or might cost, inexperienced programmers.
As @bigown said the account is based on the amount of data trafficked, not on the number of users, based on that you can check and estimate what the cost will be, the value is on this page here link
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