amazon affiliate site. multi product or not?

Sup guys,

what do you guys recommend. Multi site product review site or focus on one category?
Most competition i see focus on ONE category. Why is that? Wouldnt it be better to include hundreds of different products?

Id say multi product site is better but start with one category and then expand into another, then another etc. The obvious downside is that you are putting all ur eggs in one basket(domain) so dont go too aggressive on the blackhat.

Small niche sites work too tho, but this is the best strat in my opinion.