What is a high number of downloads per month? What should I shoot for?

My best image is 6/month, and my second best only 2/month...

I've tried to look for the most popular images, but that feature was offline...

What has everyone else experienced for dl/m?

The highest I ever had was 124  dls/month but in the last best match re-shuffle it slowed right down  and is now at 72 but around the same time another one took off and is now at 92,6.   
I currently have 5 images at over 50dls/month and 10 at over 100dls/month. 
3 of them are very similar images of something that I thought of but there wasn't much of in the collection and them along with 2 more similar ones have a total of nearly 200 dls/month. I have noticed a few copies of them recently but I still have the advantage in the search because of the high downloads month ratio which seems to make a difference in the best match search.
A lot of it is the luck of finding a concept that hasn't been well covered or managing to do it better. I constantly look at magazines for inspiration and have had some great ideas this way.

Hmmm.... 88.8....... is that some sort of Fibonacci thingy...?

...I currently have 5 images at over 50dls/month and 10 at over 100dls/month.

That's fantastic, fotografer ... way to go!
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Thanks, congratulations yourself.  There's a lot of luck involved in this on IS and else where.  I have images that I think are much better that don't do nearly as well.  One image that I have on 22.9 month (and has been as high as 50ish) I nearly didn't bother putting up as I thought it would be rejected for bad lighting but decided to put it up and then repeat the shoot and then take it down but it did so well that I left it there and the re shoot which is so much better doesn't do nearly so well.
Another one that I have had as high as 40 month but went down to 9 after best match changes barely sells on other sites. It only did 3 downloads in first 3 months at DT.
It's extremely difficult to predict best sellers.

Hmmm.... 88.8....... is that some sort of Fibonacci thingy...?

Not Fibonacci, but a unique number nevertheless. It's a Harshad number (a number divisible by the sum of its digits), and is the sum of eight consecutive primes. The number 8 means "sudden fortune or prosperity" in Cantonese - judging by how often I've seen it, "888" seems the way to go.

Barings Bank strictly forbade using number 8 in any documents since then.

(OK, I made that up