Or.. the demand went wayyyy up because lots of people have resumed playing? There are many items that used to sell for astronomical amounts that have now reduced. It's difficult to pinpoint a cost increase or decrease of one particular item to the link, but the downward trend in pricing across MOST items says to me that overall it has reduced prices rather than increase them.
I'm not sure what your personal income has to do with supply and demand? If things prices have moved up you should be able to find something to sell (acquired through gameplay) to increase your own profits since items accross the boards would have gone up and the price is just a reflection of gil inflation, if the price of just one item has skyrocketed and the price of everything else has tanked there is likely a different reason for that items increase.
While I still don't see the harm and have not felt any sort of disparity (though I may be less affected having always been on a relatively large pop server) I think the limitation right now is because they CANNOT allow selling right now, not that they do not want to.