Which would you rather have? A hundred images that will earn 100 sales per year or ten images that also have the potential for earning 100 sales each year? That is the difference between Primary and Secondary images.
Primary images are those "winners" in your portfolio that have steady sales and slowly climb up the levels. Secondary images therefore are the ones that sit for a long time before they ever see a sale, and that's IF they will ever see a sale.
What is a Secondary image? Essentially, they are snapshots, images well covered in the database, or images that are average or below average in how they communicate a concept. Many Secondary images are actually extremely well done photographs but still may never get a sale because of competition.
If you're standing in front of the Great Pyramids of Giza, are you going to refuse to take a picture because it's been done before? Are you going to resist uploading the image to DT? Of course not! You're going to take that picture and you're going to add it to your portfolio but you should also know the image is probably never going to sell unless it's superb compared to the competition.
Primary images generally are of a subject with little competition, show great imagination, or are just extremely well executed. And they sell and keep selling.
Can you imagine what your sales statistics would look like if all your poor sellers and duds sold as well as your best sellers? That should be your goal in stock, trying to hit a home run every time you upload an image.
That is, of course, easier said than done. You're still going to upload those common vacation pictures and snapshots. And you should because a percentage will sell and the greater size of your portfolio, the greater percentage that will sell.
Regardless, the point of this dissertation is this: many times your photography is limited when on vacation or doing whatever. But when you have an afternoon that is going to be spent shooting stock, you have a choice: Is the time going to be spent shooting Secondary images or are you going to try to hit a home run? People continue to upload the same images day after day, isolated tomatoes, someone talking on a cell phone, or a generic building from downtown.
For the time you spent shooting, was it really worth it to get that picture of the tomato? You will make tremendous progress with stock when you realize there is a difference between Primary and Secondary images and use your shooting time working on Primary and uploading Secondary images only when they are quick opportunities because you were in a certain spot at a certain time.
Going back to the original question, which would you rather have, ten images versus one hundred images where each set will earn 100 sales per year... The answer is... you want both! Collectively that's 200 sales each year! However, when you have the time for serious stock shooting, work on increasing those Primary images. Wouldn't it be better to have 100 primary images instead of the ten?
It's a simple concept you've heard before: Maximize your potential. So... step away from the strawberries, put them back into the refrigerator, and let loose the real photographer in you!