Go read his post again.
€30k isn’t the issue. It’s the lack of guarantee or monetary protection in place that people have the main issue with when spending that level of money.
It’s not unreasonable to expect some form of protection or guarantee.
€5k and €10k you would argue that the risk is worth it without a guarantee as you end up with a type rating which costs more than €10k to acquire.
€30k with no protection or guarantee is unreasonable and entirely unethical.