A low price is easy to compare because it is visible. The cost of replacing an item twice, losing work while it fails, buying special accessories, or disposing of it early appears later and in different places.
Start with the job. A rarely used tool can be borrowed or bought cheaply; shoes worn through every workday need comfort and durability; a device holding essential files needs support and backup. The same product category can justify different spending for different lives.
Estimate cost per use only when use is realistic. An expensive coat worn for ten winters may be good value. An aspirational appliance used twice is not improved by its warranty. Reviews are most useful when they describe long-term ownership rather than the excitement of unboxing.
Repairability changes the calculation. Replaceable batteries, standard parts, washable covers, and local service can extend useful life. Check whether the manufacturer publishes parts and whether repair costs approach the price of replacement.
Buying better is not always possible when cash is tight, and lectures about quality ignore that constraint. Borrowing, buying used, choosing a dependable mid-range model, or delaying a nonessential purchase can narrow the penalty imposed by a limited budget.
Value is personal but not mysterious. It is the total cost of getting a real job done reliably, divided across the life you actually live.