The opposite of "bare expense" could be "luxurious expenditure." This term implies that money is being spent on something beyond what is necessary or required. It suggests an abundance of resources and indulgence rather than minimalism. Another antonym for "bare expense" could be "somptuousness" which suggests opulence, extravagance, and lavishness. Similarly, the antonym "splendorous expense" also implies a significant outlay, but for something glorious, magnificent, or grand. In contrast, "bare expense" evokes a sense of frugality, simplicity, and austerity. Ultimately, the choice of antonym is dependent on the context and intentions of the speaker.