First of all only very few surfers would do that, more then 99% won't do it...
And those very few seem to like your gallery so much that they want more!! That's good! So what do they do? Well as you said some of them will change the URL a bit to see more similar galleries.
But when they have seen all your small preview galleries they still can't get enough of your content and they sign up to your sponsor!!! Hooray a sale!
