[JoeD]

Depends on the type of editing.

If it's fixing spelling mistakes and grammer, yes, yes, yes! But make sure all your existing customers are given the option to download the updated version. To an extent I'd also include consistency errors in this too, but the key point here is that these updates should be offered for free to your customers.

If it's tweaking weak parts of the story, adding more detail or otherwise editing your style, I'd say no. Take that advice onboard and use it to better your next book instead.

I really wish more authors would provide free updates for spelling, grammar and formatting mistakes though.

PS I voted NO since you were hinting at more than spelling etc