Wealth is crucially important in Pride and Prejudice, since the general plot revolves around the fact that the five Bennet daughters will have no way of financially supporting themselves once their father dies and their house is handed over to Mr. Collins. There is almost no conversation about potential spouses that doesn't also calculate the annual income that the pair might have to live on. Several characters are even openly gold-diggers when it comes to finding a spouse.
One of the ways the novel achieves its very strong sense of realism is by having very detailed and exact references to money, even in minor situations. One example of this is Lydia wanting to treat her sisters but having to borrow money from them instead.
The fact that women are constantly having to appraise their potential suitors based on relatively limited information is a testament to how in-the-world women actually are, despite all the rhetoric that they belong strictly in the domestic space.