Buying a house.
You're on the look out for a property, you have a budget and see what's available at the time. You find an ideal home, maybe a little over budget but it looks perfect. you make an offer and it it gets accepted.
Unfortunately it is part of a chain and due to circumstances out of your control somewhere along the line the deal falls through. Now in a situation where you can keep your offer on the table (which could go on for weeks) or maybe look at a different properties as the market changes constantly as different opportunities arise and people shuffle their property portfolios.
Long story short, a semi-detached property is not going to bolster your defence or net you 20+ goals a season. It may even require underpinning so you damn well better get a survey.