Online ticketing site Viagogo said it had seen an increase in the number of people who had put their seats up for sale in the wake of the singer's late appearance.
The firm said it had seen a 48% rise in listings for his tickets this morning, many trading for less than half the box office price.
Viagogo spokesman Ed Parkinson said: "It seems that parents with younger children have been frightened off by the chance of their kids being kept up beyond their bedtimes, or missing the last trains home."
Lisa Knight told ITV News that she paid £300 for a pair of tickets to Justin Bieber's London concert last night but her 10-year-old daughter was left disappointed after a near two-hour delay.
In this video recorded on Lisa's mobile phone, frustrated fans are heard booing as the Canadian superstar kept the crowd waiting.
The mother said she and her daughter arrived home in Basildon at 1.30am this morning and the 10-year-old went to school tired ahead of her SATs exams.
Teen superstar Justin Bieber was also an hour late for a concert in Nottingham on Saturday night, according to the Nottingham Evening Post.
"My daughter was just so distraught we had to go before he was even on stage," one mother told the paper. There was no apology or anything – I'm disgusted."
Another parent complained that she paid £330 for her daughter to meet the Canadian singer but the experience lasted "no more than 20 seconds."
Former Coronation Street actress Wendi Peters said her daughter had to leave the Justin Bieber concert before the end and now "isn't as big a fan as she was."
Twitter user Nicola Gray said her daughter arrived home at 1.30am because of the star's "laziness". She addressed another tweet at the O2 arena demanding a refund of the £68.25 ticket.
Another mother said it was "awful how late he was":
The O2 venue in London has apologised to young fans after teenage superstar Justin Bieber was nearly two hours late on stage at his latest concert.
The Canadian artist was opening the first of four nights at the London venue but failed to start his performance until nearly 10.30pm, just half an hour before the O2's curfew.
Many youngsters were forced to miss the gig altogether in order to get their last train out of London.
Tickets for the show began at more than £50.
Justin Bieber fans told Daybreak that children were falling asleep as they waited for the Canadian pop star who was two hours late for his concert at the O2 Arena in London.
One woman said a young girl "fell fast asleep" in the audience before her father took away.
"We were all fans," a man said, "and now we hate him."