30-50 total you mean? But 10 at Pond5?
10 out of 3,000 is 0.3% of your clips each month.
On a cheap site I sell between 30-40% of my clips each month (P5 stats are MUCH lower).
On Shutterstock I sell about 1.5-2% of my clips each month. Since the prices aren't 20 times higher there I make more money on the cheaper site.
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This is all very complicated, and can have a lot more to do with the competition and search visibility on each site, than the actual price.
On the other hand, why are 90% of all Shutterstock sales discounted sales? That tells me buyers DO care about price, and they would much rather pay $49 or $59 than $79 for a clip.
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If you have been at P5 for many years, and your clips pop up in search all the time, you can price a bit higher. The ones who sell the most at Pond5, however, have their clips priced between $40-80.
If you're a new player, setting a high price at Pond5 could be an advantage, since only a very specific search would result in your clip being found, regardless of the price.
If you upload a NYC skyline clip today it doesn't matter if it's priced at $25 or $2,500. No one will find it anyway, unless they are looking for a very specific angle, date, movement, or resolution.
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So maybe the right strategy for Pond5 is in fact to price high, since you won't sell more with lower prices anyway because of the sheer amount of clips you're competing against. This isn't optimal for all sites though, and is more a result of the extremely bad averages sellers at Pond5 seem to get. Even top sellers don't seem to sell THAT many clips when you take into account their 30,000 clip portfolios...