about three-quarters of all premium bond savers have never won
This is to be expected, since many of them have few bonds, and therefore little chance of winning.
There used to be a fashion of buying £10 for a baby or child. Many of these people have never bought more.
I don't think Tracker Funds were available 50 years ago, but if you had put £10 into a generalist Investment Trust, it would probably be worth very much more.