Because without representative sample, your results will not be valid.
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1. Better chance of uniform sample. 2. Material for confirmations if needed.
It is important to be careful when doing anything!
Multistage sampling is a form of cluster sampling where instead of using the entire cluster, random samples from each cluster are used. This is typically used when doing opinion polls or surveys.
It is important to have the decimal place in the correct position when doing calculations manually.
Getting lots and lots of results for say an experiment then deducing a conclusion from them, compared with doing just a few really precise measurements with a few accurate results and deducing your conclusion from that. The same principle could be applied to surveys etc. also