Hey guys. I see folks mentioning that they don't work with some agencies, or that they've taken their portfolios off of them.

Why would you not put your entire portfolio on every agency, just in case you pick up a few extra sales? Is it simply because it's not worth the time to upload/tag images if you're only getting a few cents per month?

Is there any other reason, e.g. that putting your photos on numerous agencies lowers their value somehow?

Thanks in advance for helping me out.