Quality over quantity.
Promising picture numbers is a ridiculous practise, designed for the client to divide the cost of the wedding by the numbers of pictures.
"$1000 for a hundred pictures is $10 a picture, is that what we are willing to pay dear?"
It puts you in an awkward situation when you promise 100 and only get 99 really good ones, and then you have to pad it out with some rubbish just to hit your target, because it lowers the overall standard of your work.
If you want to be commodity based then sure add a number to your contract.
I show my clients an album that has 180 pictures in during a consultation. They have never said "Is that it? Don't we get more pictures than this?"
So when I deliver double or triple that amount on the USB they are overwhelmed.
Tell someone a thousand and deliver a thousand, do you think the clients will be impressed? No you will have fulfilled the contractual obligation.
Tell them that you spend time looking at every single picture, deciding which ones make the clients look their best and enhancing them even more, or just getting rid of the ones that have someone photo bombing them, or have uncle bob in the background picking his nose.
Then the client gets to understand that you are not just going download everything and mail it of to them, but you are going to carefully spend the time looking at each and every photo, and that your work doesn't end when you leave the wedding day, but continues on for many hours, and that you are proud of your final product.
We are a service industry, shoot and burn's are like MacDonald's.
Other people are like that family restuarant that serves ok food, large portions and are budget friendly, but nothing really WOW.
Then you get the high end restaurants, finest ingredients, perfectly presented, formal table service, the works. But you pay through the nose for such service.
And obviously you get people all in between, and overcharging quacks or underrated geniuses, at every level.
At a fundamental level, clients do understand this concept, but the more you charge the more quality you will have to deliver and the better service will be expected.
If you really struggle getting that across, as them;
You: "how many wheels does your car have?"
Client: "4, why?"
You: "If I tried to sell you a three wheeled car, you might tell me it doesn't have enough wheels, right?"
Client: Errr yea, of course, three wheel cars very often toppled over!"
You: "what about a car with 5 wheels?" (not including the spare obviously)
Clients: "why would I need 5 wheels? How would that work, how would it be better with 5 wheels?"
You: "Exactly, you only need the pictures that do the job without compromise, not too few and not too many"
Client: "ooooh, right, I see..."
Clients are trying to break it down financially, a bouquet costs $50, an invitation costs $4 each.
But that stunning venue costs $10,000 just to hire the venue, before food and service costs,because it has amazing views and evokes an emotional response from the couple.
Which are you, a financial decision or an emotional one? Even budget photographers have to be chosen from the multitude of other people at each price point, how do you think that final pick is chosen in the end?