the only reason you go one handed is for using a shield, or to get the dual wield skill, but as just one person can get the skill, and technically spoken nobody knows those skills exist, it would be pointless to not fight with a shield. (just in my opinion)

Edit: 
just one question, how should our "Earning money" skill work with leveling up? just like our normall levels like 1, 2, 3, or more like the more you make the more you can do without a real lvling system?