"Needless expense" refers to spending money on something that is not necessary or could have been avoided. It implies that the cost incurred was unnecessary and could have been saved or used for something more important or useful. Full definition
In addition to needless expense for owners, and antibiotics potentially having their own adverse side effects, unnecessary administration of antibiotics may lead to the development of antibiotic resistance which may further complicate therapy in the true «Lyme - ill» patient. (burlingtonvetctr.com)
Where Mitford saw flowers, monuments and other funereal accessories as needless expenses, Ball considers each as metaphor, symbol, symptom and substance. (religion-online.org)
Your Great Falls insurance policies should be balanced — that is, they should provide you with enough protection to reduce your exposure without «over covering» you, adding needless expenses to your budget. (netquote.com)