Thank you for all your replies which I am finding tends to agree with what I was thinking.
Uploading to 10 is a tedious process with very little or no returns.
I keep looking at the Microstock Poll Results on the right side of the screen and with the exception of two of the middle tier, Dreamstime & DepositPhotos, which I would place in my Top Tier, removing Pond5 and iStock, it definitely looks that I should reduce the 10 to 5 or 6.
It is quite a challenge as I do not include people in any of my submissions and tend to shoot landscape, nature, historic, and bridges.
Why I do not like photographing people is that I once asked 2 people, who I did not know, but were an integral part of an image, to sign a model release, and they demanded money or would not sign unless I 'coughed up' loot.
That put me right off from that moment on.
I do appreciate the Forum here and although I am a newbie on the forum, but an longtime photographer, I find it helpful to keep up with what is happening in the Microstock world and fellow photographers.
I've put a lot of time in over the years "building" portfolios on smaller sites in the hope of a return when the port reached a certain size...in the vast majority of cases hard to justify the time spent.
Same for me. I started out thinking 25 was a good number, then saw the returns and cut down. Cut more and left more.
I have a serious personal issue with these starting sites and old doomed sites, dumping as well as their invisible distribution and partners, that we can't track and aren't told about.
Top Top four and Alamy makes five, I can't see anything past that as being useful. Unless you are on 25-50 sites with thousands of images and have a staff to upload.