What an absolutely bizarre way of thinking, and of ensuring your dc miss out on a wealth of opportunities 
football is a waste of time for girls because it is unlikely to lead to the same sporting career and earnings as for male footballers
How does that make it a waste of time ?
What about fun, enjoyment, fitness, the social side, the things they learn about resilience and not giving up, but also keeping thing in perspective, and working as a team, and supporting one another ?
Neither my dd nor ds who both play football (and still do as adults) were ever likely to make it their career, but it has been (and continues to be) a really positive thing in both their lives.
In UK schools, including private schools, there are so many things amiss, like they don't teach languages, for example
You clearly are just making stuff up now. I don't know if that is through ignorance or if you are just trying to wind people up.
All my dc learned French at school and two of my dc learned German too. Not private, or grammar schools, just our local comprehensives.
They don't teach chess at schools either - a more useful sport (even though massively male dominated with abysmal results for women) - so I would encourage daughters to play chess
My dd learned to play chess at Primary school, and played in County competitions. She managed this whilst also playing football for her school, District, and County.
It isn't a sport, but she did learn it. Not that it ever helped her health and fitness, which is really what sport is about.
I'm really not sure why you are just making stuff up / spouting rubbish.
I don't have millions to leave to my dc
Oddly enough, nor do I, and, I suspect, nor will most posters on MN. What is your point ? All of my dc will need to make their way in the world (indeed, mine are already, as young adults) and therefore my job as their parent is to make sure they are well rounded individuals, who don't think the only things worth doing in life are things that they might be able to earn a living from.