Yes .com extension is best for your earnings when you sell it. You don't get more money if you have .info extension.
Arn't you so curious to what will happen, though...I remember when the computer, itself, was just a black screen with green writing...it's crazy now!
The main reason is that you can buy .info for as cheap as .99. Many people registered the ones of high value years ago. Also 4-character extensions generally do worse than the original top-level ones.