This is Utility theory, a well known and long standing economic concept. Utility theory without getting too into it, expresses the fact that an amount of money can have different VALUE to different people. The standard example, is Bill Gates walking along the road and seeing £10. Is it even worth his time to pick up? His daily interest alone will far outweigh that money, so it has little value to him. Whereas someone with no money will be happy to pick that up. That £10 is a fixed amount of money, but it doesn't have the same value to each of them.
The lottery is another example of this. Sure, the expectancy is negative, but the multi-million pound payoff has huge value to some people and so it is a reasonable decision to play the lottery. It is about what it is worth to the person, not just an absolute number.
What else are you going to do with your £1? Make one trade at 10p a point with a 10 pt stop and try to turn that into millions? However, unlikely and negative expectancy aside that £1 in the lottery could be life changing. Your .10p a point trade with positive expectancy is a lot more unlikely to be life changing.