While Brad's answer may have seemed harsh to you, he is not very far off. You can really hurt yourself, and your business, and your family if you have one, not to mention the industry of photography itself. Other photographers can become irate if you disrupt the way of things by low balling.
This is what will happen if you do not charge enough for your product. You will be booking multiple weddings and feel that life is good because you are so booked up.

But soon you will find that you do not have enough money to produce the products that you have promissed your clients, and you have already shot their weddings!

Yikes! So you try to book more weddings, which only compounds the problem.

You will be stuck with one of two decisions. You will either have to offer less product for the same price, or you will need to offer the same product for more price. Your instinct will to be to offer more product for more price, at which point you will be in the same spot. I have tried all three.
The solution is to price correctly from the get go.

( I am having fun using these smilies. One sec, need to refill the wine glass)
I do want to add a small thought to what Brad has said. Add up all of your expenses. Everything that you can think of, and I mean everything. After all, you are running a business and not a charity, right?
Here is the part that I would do a tad different. Once you figure out your total cost to produce a product and instead of asking your self what would it take to make it worth while, I would say that you need a bench mark. According to
PPA, if you are a digital wedding photographer your bench mark is 25% cost of sales. Meaning, take your total cost to produce your product, and for simplicities sake lets say that cost is $100, and calculating what that figure is 25% of. $100 is 25% of what number? $400. Or you can just multiply your cost by four.
Use this rule. You will be glad you did.
Brad listed some costs, but I thought I would just go through my sequence of thoughts as well. I am sure that I may duplicate some of the items he has listed though.
30 Minutes for initial phone consultation
1.5 hours for in studio consultation
.5 hours of travel to wedding
6 hours of coverage
.5 hours of travel back from the wedding
2 hours to edit wedding
1 hour to backup and put images online
4 hours to design album
1 hour for album revisions
1 hour to upload the album to the lab and send order to your book binder
5 minutes of quality control once the product arrives back at the stuido
5 minutes to call your client and tell them that it is ready.
20 minutes to present the final product to your client.
Material costs:
Fuel to travel to event and back
Prints for album
Coat and spray of prints
Bind and mount of prints
book cover of prints
shipping prints to the book binder
shipping prints back from book binder
Add all this up. That number is 25% of what number? That is what you charge for your product.
So what do you do with the other 75% you collected from your client?
Pay your salary
Pay your studio rent
Pay your insurance
Pay employees
New equipment savings
Save some money for working capital (rainy day fund.. after all photography is a luxury and not a necessity)
Advertising (magazine, web, bridal shows, etc)
Phone Bill
Internet connection
Cell Bill
Electric if it is not covered in your rent.
Print costs (sample prints and albums)
Advertising materials (business cards, brochures, etc.)
Just as the PPA sets the bench mark of 25% Cost of Sales, it also tell you what percentage the above expenses should be. How much of the 75% should you be putting toward advertising? How much should go towards employee costs? etc. It has a percentage for everything... including YOUR SALARY!
I can't and won't disclose that information because this is information that the PPA provides, and you need to be a member to get that info. Intellectual property kind of thing.
At any rate, I hope that this wasn't more than you asked for, but it is the way the world works. Its a bit more than "how much should I charge for an 8x10". People who have been in this business for some time are passionate about making their business work, and they are proud of the scars that they have received in their journeys to get where they are. I can tell you though, once you have all your numbers in place, you have a feeling of enpowerment that allows you to move forward with confidence. Find your numbers. They are different for everyone, because we all deliver a different quality of product. Let me know if you want me to go into that at all and I will.