Hi, $100 per hour is not the market rate. In fact there is no "market rate" for wedding photographers, unlike a Samsung TV selling at different stores at similar range of prices, because the Samsung TVs are the same model, no matter where they are sold.
Wedding photographer are different, they are humans, they have different DNAs, different brains, different skills, different styles, different aesthetics vision, different years of experience, etc. Hence, it is not possible to put a "market rate" on every wedding photographer.
Same goes for wedding couples' budgets. There is no "market rate" for the wedding couples' budgets because different wedding couples have different requirements and priorities on holding their weddings.
Usually accepting a 2-hour wedding job rather than a full-day-package is an "opportunity cost" for a wedding photographer, especially if it is a weekend (most actual day weddings are held on weekends). Because after accepting the 2-hour job for the lunch time, he/she will not be able to shoot for the rest of the day, unless he/she manages to find another wedding job that starts in the late afternoon/evening. Hence, some photographers with good skills and good experience will have a "minimum package" that ensure he earns a minimum income for that day, besides covering the transportation costs and meals.
I'm not sure if $200(consider that you pay max $100 per hour) is enough for the wedding photographer that you engage. If the photographer is taking taxi to your ROM location and back, the taxi fees could be $50 in total if the photographer's house is far away and if the taxi companies hike the rates and extend the peak hour timings again by your ROM date 11 Nov 2012(very likely), which means the photographer is only earning $150 maximum or lesser, which may not be enough to buy a pair of Nike sport shoes in this high inflation era.
#PS: the camera gear that the photographer use could be easily above $4000(just basic setup) and even beyond $10,000 for the pro. So earning $150 or lesser may not help in paying back these expensive gears.