Martha used to be a caterer and did her own cakes. She started before Sylvia, I believe, even though Sylvia is older. I don't really know much about Sylvia, so I cannot make an educated statement about her, although, I know Sylvia's clientele is directed towards the upper class...highly priced, which may limit her as far as production goes...but, I know she obviously does a lot of cakes.
Martha is now on the business side of her business...I agree. But she started out doing her own stuff. We all start somewhere and maybe she just got too involved with the business part that she couldn't do it all.
Personally, I like Martha's cakes...whether she does them personally or not, she does have a say so on what goes on.
It is the same on all the food network shows...like Emeril, Bobby Flay etc. They have a whole staff in the Kitchen making all the food.
I don't know if I would ever want someone doing cakes for me. I enjoy it too much.
Maybe that is Sylvia's thought too. She wants to be in there doing it herself. And Martha is happy being the over-seer.