Which is worth it to sell?

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Because of affiliate marketing, one of the profitable activities in the net nowadays, there are lots of stuffs and products available in the world wide web, sometimes it's hard to decide from so many options to choose from. I'm just wondering which is worth it to sell and could compensate your time and effort: products that are not so expensive and easy to sell but with low commission or those products which are expensive and hard to sell but with high commission?