Well, attempting to become an actor the old fashioned way (no degree) could be far less expensive if it wasn't for the massive house price bubble in the city were most of the work (and netwoking opportunities) are - London.

Also since my contact with the Acting World was via a few years of Acting Lessons (in my case purelly because I enjoyed it rather than having any ideas of going into it) which seems to be quite a common side-gig for such people, I did meet a significant number of actors and actresses who weren't from rich families and just kept limping along for years after having taken an Acting Degree, doing maybe one play a year (and hoping it would run for longer than one month) whilst doing other work in between (such as working at a pub or giving Acting lessons to amateurs like me) to make ends meet.

This was a decade ago and expenses for living in London, namelly housing, have gone up a lot since.

There's a bio from Michael Caine and reading it knowing present day Britain makes it pretty obvious that the conditions that allowed so many working class lads to get were he got back in the 70s (and which, by the way, also applied to that generation in the music world) aren't there anymore - nowadays if mommy and daddy aren't at least upper middle class or wealthier, it's pretty much impossible to make it in the career even with a scholarship to a good Drama School because of how stupidly expensive London is. Personally I think this reflects negativelly in the quality of British Actors and even up to a point in how much and how well certain kinds of life experience get played (i.e. based on stereotypes and shallow rather than realistic).

And all this is without going the whole "connections are crucial" part of it which means the scions of the right people get all kinds of chances giften to them whilst the others are fighting for crumbs.