what's going on about the sales? 0 download for long time

Normally there will be roughly 100USD sales here every month but recently the trend looks worse and worse:
April :120 USD
May :80 USD
June :31 USD
July:12 USD
Aug: 0 (as of Aug 16)
.........

I am always 0

Constantius - But you only have 12 videos up. You have to put the work in if you want to get sales. I have just 1 sale from the past 3 years when I had just 30 videos available. I've just recently taken it more seriously and have added over 200 in 1 or 2 months. I still don't expect to see sales for several months.

I started uploading at the end of February, uploaded less then 200, then didnt have time for Pond5 and my first sale happend in August. It takes time, and more uploads, higher chances.

I've got over 2300 in my exclusive, and only had a dozen sales so far. Guess it takes time to get discovered!