Most of the journeys on BlaBlaCar are long distance (over 100 miles). This is because these journeys are both expensive and often planned in advance. Therefore it’s both easy and worthwhile to share these journeys.
If you have a regular long distance commute, for example, you travel from London to Manchester every weekend, then BlaBlaCar is very useful.
Yet, for shorter regular trips, it will be easier in the long term to share your car with another person who also makes this journey regularly, organising your carpool directly and not through BlaBlaCar.