I do think your question is slightly odd, ipad. My ds moved to a private school for secondary - for mostly SEN/pastoral/size of class reasons - and I would love for him to go down the art/graphics route should he so choose.
He is fairly academic (near the top of his year in all three core subjects) but also adores illustration and drama etc and still has no idea what he wants to do for a living.
The difference between his school and the 'best' state school option is most visible when it comes to non-core subjects - I really do feel he's getting a fantastic art and music education, for example (and not necessarily/always down to better facilities).
The thing is, I won't judge the outcome of his education on what he earns when he eventually does start earning or on what qualifications he achieves, but on how happy and settled he's been during his time there, on how 'all-round' educated and cultured he has become, how independent a learner, and how mature, considerate and reflective he has become.
Obviously all of these outcomes are achievable within the state sector and most of them are equally related to parental input, too.
But from amongst the choices we had open to us, we feel very strongly that his school gives him (us) the best chance of him 'turning out' how we would like him to. Not of earning a particular salary or having a particular career.
And (to slightly answer the OP) we are sacrificing quite a lot. Dh has had to take early medical retirement (has terminal illness) and we have downsized our house considerably for location and fee-paying purposes. We don't have lots of spare money but a bit more than the OP.
I do think the primary years can be quite expensive for all the reasons others have listed (even just all the birthday parties!) and I (personally) think private primary schooling is far less worthwhile than secondary. But that is just me with my options and location, and not yours!