Questions for myLot

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I registered myLot this week. I posted and responsed discussions for several three days. Well, I feel confused about the payment. Does every post get pay? Because the first day, I responsed 5 discussions, and was paid 0.09$, well the second day I just got 0.04$ for 9 posts.The payment is not based on the quantity of the posts? I cannot unserstand , could someone tell me in which case I will get pay for every post? Also ,for the photos, can I post any pictures? For I 'd like to post some pictures of our music pillows, does mylot allows such photos?