To the list of industries where there is a built in x10 on all quotes add Weddings...
But that is for a different reason... it's not increased pricing because of increased risk, it's increased pricing because of increased willingness to pay combined with a sense of "more costly must be more valuable".
If I were a photagrapher, I would likely want to charge more for a wedding then say the engagement pictures (or other portraits) which have a similiar amount of effort. If I have a problem with a portrait I might need to call them back in to reshoot. If theres a problem with the wedding pictures I'm stuck.
The workaround is better preparation, more people, more equipment, etc. All this costs money.