Has anyone of you every have attended a focus group

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Recently, my friend had introduced to me about focus groups and its importance firstly its a good way of making money you should making money somewhere from $70 to $250 per discussion in a focus group by saying your opinion about products or brands in general and secondly you also get some experience from focus groups, since marketers would pick you as there choice if you regularly visit these focus groups, last week i had been focus group on beer sampling, and i had wonderful experience, i had to taste different brands of beer and say my opinion as to which brand i liked and why? I just need to know has anyone ever been to such groups