Money does not buy you class…or does it? We live in a world where people now generally look for value for money over luxury. It is not clear whether your complaint is that first class should be intentionally overpriced and expensive to discourage undesirables who cannot afford it, or that you think it should only be available to middle class passengers who prefer to sit with their own kind.
Businessmen who have paid £300 for their tickets may not want to sit in first class with a group of stags and hens, or single mums and children who paid considerably less. Although they still have every right to be there
There is nothing stopping you from upgrading using the same “ghastly app” that these frightful commoners use. No need to pay more when don’t have to unless, you require a full first class ticket to satisfy one’s ego