The first months can be the most expensive. Start by writing down the purchase goal: what you need, for how long, and what outcome is good enough. Without that, it is easy to compare specifications that do not affect the decision.
Step-by-step process
- Define the need and use period.
- Collect 3–7 genuinely comparable reference points.
- Calculate full cost and a cautious scenario.
- Price the risk and set a walk-away ceiling.
- Verify the decisive facts before paying.
Gather the evidence in one place. Separate confirmed facts from seller claims and from your own assumptions. For every uncertain item, use a low–realistic–cautious range. This produces a range of outcomes instead of one falsely precise number.
The cost worth calculating
Calculate the entry cost first: price, delivery, fees, setup, initial repairs and mandatory extras. Then add running costs, time, energy, servicing and depreciation. Finally subtract a realistic—not aspirational—resale value.
Example: a deal costs €900, but requires €110 delivery and €210 repairs. A comparable working item costs €1,150. The low sticker price does not create a saving; full cost is €1,220 before risk.
How to include risk
Risk should change the price. The harder it is to verify condition, history, scope or seller reliability, the larger the contingency or discount you need. When risk cannot be reduced through inspection, documents or an independent opinion, walking away may be rational.
Common mistakes
- comparing different scope or versions
- omitting post-purchase costs
- treating asking price as market value
- giving in to time pressure
- not setting a walk-away price
Final decision check
Before paying, run a reverse test: what would need to be untrue for the deal to stop making sense? Verify those points first. If a small change in assumptions reverses the decision, treat the result as unstable.