I use Flickr to post a lot more images than I show on my website (all watermarked of course). I try & show only what I consider my best on my website, but I have sold images that they saw on Flickr & not on my webite..beauty is in the eye of the beholder kind of thing. I have a link to my Flickr on my site so if they want to see more it's there. Case in point, I have a guy that is spending over $500 for some of my images (landscape-cityscape)...4 of them he saw on Flickr, ones that I didnt consider to be my best, (and actually had to go find them in my collection...
) but they obviously triggered something for him to part with his money.... 
I sold 1 for a book cover from Flickr.because it wasnt on my site...
I also use Flickr to see what keywords have been used and which images come up for those words, and make sure those are inputed into my personal site.
For me at least its worth it, for others maybe not
EOS 6d, 7dMKII, Tokina 11-16, Tokina 16-28, Sigma 70-200mm F/2.8, Sigma 17-50 F/2.8, Canon 24-70mm F/2.8L, Canon 70-200 F/2.8L, Mixed Speedlites and other stuff.
When it ceases to be fun, it will be time to walk away
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