As a photographer, what's the difference between RF and RM about your income? Which type sales better and bring your more?
and I found in Alamy, a lot number of pictures just shooted in the street, park, or every common place in a city, these snapshot will be sold in actually?
what kind of photos should I upload to Alamy will sales good?
I hope I can get some experience about Alamy from you. I joined it just few days. And I don't want to make another tragedy again( As my DT problem...)

You need to be aware that the amount actually charged for a photo usually bears very little resemblance to what's shown on the image calculator, as it seems most buyers have negotiated deep discounts.
There are occasional high sales, but fewer and fewer; most IME are sub $50.
Remember also that prices quoted on their forums are generally gross, not net.
Check out how many millions of files there are there, and be aware that the owner said they made IIRC c330,000 sales last year. Lets you know what your chances are.

You may have to wait months for a sale to clear before you get the money.
It's absolutely not a get rich quick scheme. I had several hundred images and eight months before my first sale.
Just to manage your expectations.
Be aware that if you have a file RF elsewhere, it must be RF on Alamy, also if there is any tiny, out of focus hint of a person or something that needs a PR that you don't have releases for - they don't do RF editorial.

It's seems like I have know something!

If a file is RF-Editorial in microstock agence, that means it's OK to set as RM in Alamy?

And a file is just RF in microstock, it must be RF in Alamy?

You need to be aware that the amount actually charged for a photo usually bears very little resemblance to what's shown on the image calculator, as it seems most buyers have negotiated deep discounts.
There are occasional high sales, but fewer and fewer; most IME are sub $50.
Remember also that prices quoted on their forums are generally gross, not net.
Check out how many millions of files there are there, and be aware that the owner said they made IIRC c330,000 sales last year. Lets you know what your chances are.

You may Just to manage your expectations.hve to wait months for a sale to clear before you get the money.
It's absolutely not a get rich quick scheme. I had several hundred images and eight months before my first sale.

Be aware that if you have a file RF elsewhere, it must be RF on Alamy, also if there is any tiny, out of focus hint of a person or something that needs a PR that you don't have releases for - they don't do RF editorial.

what kind of photos should I upload to Alamy will sales good?

My best single sale this year RM at Alamy earned me (i.e. after deductions) $130. That is a reasonable sale - but it would not surprise me if that picture never sells again. That is an image which is never going to earn very much money.

If a picture is seldom going to sell (for whatever reason) then it makes sense IMO to sell it where it will potentially go for the most money.

$$$$   

Not necessarily, particularly at Alamy.

As a photographer, what's the difference between RF and RM about your income? Which type sales better and bring your more?
and I found in Alamy, a lot number of pictures just shooted in the street, park, or every common place in a city, these snapshot will be sold in actually?
what kind of photos should I upload to Alamy will sales good?
I hope I can get some experience about Alamy from you. I joined it just few days. And I don't want to make another tragedy again( As my DT problem...)

The difference between RF and RM is the usage rights associated with the image and the control you maintain over your images.  At Alamy, there really isn't a difference in income as they will adjust the price to their customer as appropriate.  The consideration of which types of sales bring you more depend on what types of agents you submit to if you submit on a non-exclusive basis.  If you submit RF to Alamy and then the same images as RF to micros, then your income will be different if you submit RM to Alamy and RM to other traditional agencies on a non-exclusive basis.

Yes, snapshots sell at Alamy...and they sell at other agencies as well.  Common places in the street or at the park are licensed for everything from editorial use in magazines and travel guides, to internal corporate uses that do not require model releases (as they are not used to sell or endorse a produce on a commercial basis).

Every person's portfolio is different...and every search algorithm is different at each agency.  The challenge is to find which agency works best for you based on your style of photography and style of keywording.