Money is overrated to an absurd degree.
That's the annoying thing about it, there are real limits to what it can do for politicians come election time, but said politicians always want every advantage they can muster, especially when they have all sorts of consultants telling them they
need something, so they go out promising all sorts of favors and special attention in exchange for large donations. In the end, they might have won the election even without all that money, but we'll never know because most want to play it safe and take the cash.
In this instance, it's not exactly clear that Democrats would be exponentially worse off without Pelosi's big bucks. The idea that another big time fundraiser won't come along eventually is silly, and on top of that, there is no extreme need to match Pelosi's fundraising figures dollar for dollar either.