Do I have to register to use the supply and demand masks?
Yes.

Do I have to pay for using the eMarket?
No.

What information is required to make use of the eMarket?
It’s up to you. Every user decides on his own, what information will be given.

Do I have to be a member of the ESPP to use the eMarket?
No.

How reliable are the supply information in terms of actuality?
Since every user can fill the content, the reliability and actuality depend on their inputs. The host and administrator cannot be claimed and blamed to bear this responsibility.