Jumping in here - I do sell to show people and I don't tattoo. If I get to a point where I want to show or where I can't remember their names and parents, then it's time to tattoo. Also if you have a very "regular" looking breed - if they are all solid white it's a little harder than with the huge color variety I have.
When you pick a name, go and register it with ARBA so nobody steals it out from under you. It's really cheap to register a rabbitry name.
Cremes are be born the same color, it's hard to tell them apart!! Since some of the breeds I raise come in only one variety I have to tattoo so I know who is who!