1 out of 30 recalled sounds exceptionally brutal! I would have thought 25% or so. I agree it's wrong if that's the proportions offered from recall, they should refine the self tape selection more as people put a lot of effort into recalls too on the basis that they've got a good chance of acceptance if recalled.
I agree with you ... it's cost us > £1000 so far and not done yet. But we didn't go to any open days, so auditions have been first ever visits, and helping with decision making if applying again next year (if end up on foundation or gap year this year), so we are taking it as a one off cost of checking out many of the main schools for the first and maybe only time. R has also found that the in person auditions are so helpful, she's learned loads in terms of what's expected, that she wouldn't have got from tapes auditions.
You've done very well to get so many recalls!