There is also a significant drop out rate in the States. Money is less of an issue - though it is all relative - so maybe cost is not so important. There are also a lot more destinations in the States with things to do, and depending on where you live, the weather can be very friendly to VFR pilots. The regulatory system is also very friendly to pilots. Yet the vast majority of people who take that trial lesson do not get to 100 hours.
People drop out after they have soloed as they have reached the goal of flying a plane on their own. Then they drop out because they realise they have to do some work to get their private, and they don't like that. Then when those that continue get their private, they get bored or scare themselves, or just cannot commit the time required to stay safe and current. As I said, most don't get to 100 hours.
IMO, the best way to keep things going is to find a friend who likes to fly with you, preferably a member of the opposite sex who you get on with, and go on trips. Even if it's for breakfast, or more interesting things like camping out to watch meteor showers. Play your cards right and flying small planes can be a good way to obtain such a partner, and if you are that way inclined, to repeat process.
I even hear there is an airport round here where college girls hang out and hitch lifts off those cute unsuspecting pilots
