Spikes/surges are common in every house, office and building. The intensity varies and you never know when that killer spike will occur.
Even milder spikes will gradually degrade the reliability of your equipment by repeatedly blowing microscopic holes in electronic circuitry until the equipment is rendered unreliable or non-functional.
Data is particularly at risk. The Sollatek MultiGuard is a high quality 6 way strip and 3 metres longer, that provides full surge/spike protection.