Why go to the expense of buying an electric saw when you can borrow one?

你能借到电锯，却为何去花钱买呢？

《柯林斯英汉双解大词典》

Why must you go to this expense?

何必这么破费？

《新英汉大辞典》

In addition to attorney fees, when cases go to court, there is the additional expense of “court costs”.

除了律师费用，当离婚需要法院裁决，还会产生附加费用“法庭费用”。

youdao

It's a little silly to go to the expense of sending out 90 million letters to give a two-week heads-up on the checks going out in the mail.

CNN: Senate Democrat blasts tax rebate letter

Until recently, bringing the Internet to the car has been an issue due primarily to the fact that few manufacturers wanted to go to the expense of adding a wireless communications module to the vehicle, particularly one likely to be obsolete in the lifetime of the car.

FORBES: Automotive/Tech Companies Trying to Bring the Web to the Car

Which means that you may not need to go to the expense and aggravation of creating your own mobile applications.

FORBES: For Most Businesses, The iPhone Doesn't Matter