With such small numbers, it doesn't matter whether you submit all at once or in little batches.  As to whether microstock is worth it to you, it depends a lot on what you hope to get from it.  When I started I made almost nothing; it took months before I reached double digits of dollars.  But I learned a lot, both in terms of improving my basic technique and in figuring out what had a chance of being accepted and what might sell.  That education kept me going for quite a while, long before my sales were anything to write home about.  If that's true for you, and if you have a thick enough skin to deal with regular rejections as you learn, you might find value even if the money isn't significant.  And who knows?  You might be a big success.  It does happen, even if it's less common than when a lot of us started.

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Doing all those things for two years and get nothing in return! This business is a business of fear and hope.

If you are looking it purely from a financial point of view, it makes sense, even if it's highly unlikely that after 2 years and a reasonable portfolio you will get "nothing in return".

However, if you experience some amazing places and meet wonderful people along the way, regardless of whether you make anything, perhaps it will all be worth it?

encrenciel,

You can succeed but it's hard work.  Here is the formula:

- Focus on industry specific concepts;
- Research your concepts completely - competition, trends, industry, etc;
- Create with essential keywords in mind;
- Fly with eagles. In other words, try to surpass the best examples you can find because mediocre work doesn't sell and creating it is a waste of your time;
- Go exclusive with Getty /  iStock;
- Have fun or don't bother.

Cheers, -m

All seems pretty reasonable. There's nothing too out of the ordinary or controversial in there (like we'll all have robot butlers and flying cars by next year), I guess they're just seeing the way things are going in 2016 and extrapolating for 2017.