Of course it's good, it's great to be a ECA member, should be in the ECA and open a store if you can sell your or other people's products.
It is your choice,and it is an additional way to make money and take advance in the SFI,
SFI offers so many opportunities,and we all just can take them and enjoy them.
I have an Eca store and i hope that it will be successful, belive and the results will come.
