This is because lobster is a victim of the Basic
Disney Dining Plan!
Unfortunately, many people on the
DDP, whether they pay for it directly or paying a higher rate for their room and getting "free" dining, look to the highest price items on the menu. This is based either on the attitude of "I paid for it and can get whatever I want" or "as long as it's free, let's get the best items".
For example, at Le Cellier where is a $22.50 difference in price between the lowest price adult lunch entree and the highest price dinner entree. Each restaturant receives a fixed dollar amount credit for each meal sold under DDP. Each restaurant has to make a profit.
As food costs go up it takes more money to operate a restaurant.
So as things progress more and more of the higher end cost items will vanish.
The signature restaurants do not have so much of a problem as they get paid double the regular restaurants.
If they ever do away with the Basic DDP within about six months you will find a lot more high end selections at all the restaurants.