I help run personal development courses for teenagers that run for three days and cost around £350. There's a group of us do this and we don't make any money from it - we use a high-quality venue with all meals included, we fly in a workshop leader from the US, we bring in a couple of guys to run a dance and drumming workshop. I've been involved with 5 of these workshops over past few years and they have been a great success - the kids (ranging from 13 - 19) find it transformational and they, and their parents, report great things afterwards about how they feel more confident and self-assured but in a responsible way - they are also more aware that their behaviour impacts on others - and how they find it easier to make good decisions and hold out against peer pressure. We've had kids with eating and emotional disorders who have begun to recover, and others who have turned their academic performance around.
In marketing the course we find that we get parents who really want their kids to attend but their kids refuse, and teenagers who want to attend but whose parents don't see the value in it, and often (but not always) it's the parents who pay.
If you've stuck with me this far, thank you!
My question to you is what would be worth £350 of your money? My own experience isn't very useful as I only got involved after a huge crisis with my own teenage kids, and at the point of crisis I'd have paid anything at all for help because I was truly desperate and had run out of other options.