OK.  Alamy used to be great.  

Now Alamy has a ranking system, AlamyRank, which means that new
photographers start out in a lower rank.  Picture editors' and other
photo buyers' clicks and purchases decide which images rank highest.
That means that the search results that come up first are in the upper
ranks, which is composed of work by photographers who have been
successful with Alamy and have a good track record in selling images

Only if picture editors cannot find what they want in the higher ranks
will they bother looking further.  That now makes it very much more
difficult than it used to be to start selling pictures with Alamy.

Alamy was very successful, but that attracted a lot of amateurs as
well as professionals.  There were too many amateurs trying to sell
uninspiring images, and picture editors complained that the images
were not only of low quality, but also poorly tagged, meaning that the
editors had to trawl through enormous numbers of images to find one
that they wanted.  Alamy felt that they were losing business as a
result,  hence the rank system.

It's still good if you are in the upper ranks, but less good than it
used to be if you are starting out.  

All the other information you need can be found on the Alamy site.

Thanks for the link.

I did a several "technical" searches and some rather bland word
searches.   There was a great deal of frass and a few technically
competent images.  There were a number of Corbis images that came up,
that surprised me.

I find the whole upsize it to such and such size to be a bit
ridiculous.  It's got to be so big before we will take it.

I need an additional revenue stream and I'm wondering if this will fit
the bill.

It's about the only thing short of gasoline that'll remove pine sap too.