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Maybe the reason is that you wrote in your P5 profile: ..."Shutterstock" is the perfect place to show your dream through your works... :-)

LOL the Shutterstock comment is priceless.

Other than that, different buyers on different sites.
How long have you been here?
It takes time to get in the search engine.
Pond5 has a lot more videos than other sites so what I would do is search here for what you are uploading.
Maybe it’s time to do something a little different.

I'm sorry, he's gone. I just wanted to warn him so he could correct the oversight in his profile.

He deleted his question?
LOL, that's even more priceless.

I'll add something else, this was the perfect example of not doing a copy and paste of your profile from one site to another without editing it.