I am trying to packet edit a server sided mmo, I know!!

However, I have access to the server files to run my own server, with this is it possible to have what I do actually stay?

For instance, I change gold to 100000 instead of 1000 and as soon as I remove 1 gold from the pile it reverts to 999.. If I ran my own server and sniffed me as an admin on my own server changing the money value, and duplicate that packet on a live server, would it work?


Sorry for the bad explanation but I don't know how else to explain it..