If pricing depends on someone doing sums in a spreadsheet, every quote costs staff time and every enquiry waits. After hours, it waits until tomorrow. Some customers will not wait: they keep browsing until someone else answers first.
Generic quote plugins do not fix this because real pricing is rarely simple. It depends on dates, sizes, distances, options, minimums and seasonal rules. If the tool cannot carry your actual pricing logic, staff still have to check every figure and you are back where you started.