I'm told that the chick stage is pretty short-lived and they'll be teenagers before you know it!
I have a "first-time-chicken-keeper-and-broody-mama-owner" question:
If I were to sell a broody hen's the chicks before they were at the age where she decides that they can take care of themselves, would she go back to being broody, or would she rejoin the flock and start laying again? This is hypothetical, because I would like them to be feathered out before I sell them, but another chicken keeper told me that it's much easier to rehome day-old to week-old chicks than if you wait until they're older.
I can't answer the question about the hen going back into broody mode... I have never separated a hen from her chicks yet.
As far as the selling... it really depends on your local market and the breed of bird you are selling. I advertise my youngsters as 'broody raised chicks',since they are... and make it plain in the ad that these birds are very self sufficient and will require very little in the way of special care since they were broody raised... and usually sell them between 8 and 10 weeks old. I have had no trouble selling them and have found there are a lot of folks who appreciate getting chicks which have been taught to forage and deal with flock issues already (ours free range a lot). The only advantages to selling as much younger birds is you may get more sales due to the 'cute factor' and you can sell as straight run so you don't need to deal with young cockerels which are much harder to sell later on.