To be honest I don't know. This is my list of pros and cons. Please feel free to add to it, disagree with it.
The arguments for an increase is business are:
The extra number of people in London for the Olympics. Especially those who have tickets spaced out over the time that they are here.
The fact that regular Londoners will be on flexi-time/working from home will give them more time and/or excuses to get away.
Those who cannot take flexi time etc will have to work as normal but will be more stressed due to travel problems etc and will need pampering by a working girl.
The arguments against are:
The fact that most Londoners/commuters are being urged to work from home, book leave, work flexi time etc. So will their other half/family. So regulars will be few on the ground. Those who are not allowed to do so will be stressed with their workloads and travel etc.
The Olympics take place during the school 6 week holidays so will people be taking advantage of this to go on holiday themeselves?
Most people will be travelling with family. Unlike the football world cup where business would pick up, due to the macho effect ie mostly male fans, the Olympics are a family event.
The tickets allow you do hang around the Olympic park all day, whereas the football/other sports tend to be for a few hours, with loads of free time.
More competition because everyone thinks it will be a goldmine.
Hotel rooms are already booked up and very expensive. So unless you have an incall place touring will be very expensive.
Just like the Euros people will be trying to watch as much as they can on telly. Plus the big screens all around London. And the pubs/bars have Olympic themed specials on.
And if people visiting London have free time during their visit there is so much to do in London. It's not like whe major sporting events take place in small towns where there are limited attractions and everything closes at 5.
Police will be everywhere and places like Newham have already closed down brothels and cleaned up red light districts so I don't think they will take their foot of the pedal until it's all over.