1.15 million people confess to having driven a car in the last year without any insurance, according to a survey by Sainsbury’s Car Insurance. The survey revealed that 19% said it was because they couldn’t afford it, 19% said they didn’t think it was necessary, 13% said they forgot to purchase it, while 13% said they [...]

More: 1.15 million confess to having no car insurance

Both first 2 reasons are very valid.
1)People can't bear it
2)They think it is not necessary.