Tester vs standard membership

What is the difference in between tester and standard membership?
Can tester be used in production?
Can it be set instead of yearly subscription that members pay only once and it is forever?

The “Tester” membership is only for testing the “Paid Membership” plugin here.

Testing can be on a live site where people use it on daily bases. Testing can be on a local server.

Standard is $299 for 3 months, what after 3 months? Does it work or only support expires.

The point is many small sites make from subscriptions few hundred dollars. If need to pay for the plugin every 3 months so much there is not much logic in that.

The «Paid Membership» plugin is free.
The «Membership» page is just for it demonstration.
My paid services for the plugin are described in the primary topic.

It is confusing, if it is free why to pay $1 for testing?

If $1 is the money allowing you to spend your and my working time on such 3 questions and answers, then you are definitely not my client.