I really don't know. I'm not sure if there will be commerce, but I also don't think our Heavenly existence will be floating by and waving to our friends on the next cloud bank. :) I think we will be "doing" something, and I have no problem believing that different people will be doing different things.
Isn't there a difference between us and the martyrs in Heaven? Why not also among the people in terms of rewards? Jesus said:
Matt 11:11 : I tell you the truth: Among those born of women there has not risen anyone greater than John the Baptist; yet he who is least in the kingdom of heaven is greater than he. NIV
So, by some measurement, we know that in Heaven some are "greater" and some are "lesser". I would think rewards would reflect that.
I hope you realize that is all our fancy and not God speaking.
Jesus said: "Matt 11:11 : I tell you the truth: Among those born of women there has not risen anyone greater than John the Baptist; yet he who is least in the kingdom of heaven is greater than he. NIV"
Could it be because they are glorified?
We know that the 12 Apostles will judge (the 12 tribes of Israel?), but we know nothing about the life after that. If God is not partial, than whatever the arrangement is it will not be unfair, but merciful and just: merciful because none of us deserves to be there and just because it will be impartial. However, the Scripture tells us that we will be judged according to our deeds. And that means there will be eternal inequality as well.