I would love to buy those as mini figures on their own, but not with scenes. I already have way too many things to display, so mini figures would be perfect, as I would be able to see all their characters and display them at the same time without looking like I am a 25-year-old-child, full of toys over the house. I also think my husband may draw a line on having full sets of lego while we don't have kids yet.
I already collect vinylmations and Doctor Who titans vinyl figures (plus my collection of Pandora, Trollbeads, Faerybeads, Hobbit beads and other beads in general; but at least those all reside in a huge Trollbeads jewellery box when I am not wearing them, so my 300 plus beads don't look like hoarding. lol), I also pre-ordered the Big Chief Sherlock and Watson signed action figures, so I really am running out of possible display space.
http://www.brickdisplaycase.com has really nice looking display cases for lego mini figures, much better than the ones lego has for sale IMO. They look good enough to go with the rest of my modern decor. They are a bit on the pricey side, but I am a selective collector because of my limited space, so I always search a long time to find a good display solution for my collections (for my DW Titans and my vinylmation I ordered display cases from the Container Store in the USA, even though shipping to Germany was prohibitive they were the best solution I have found so far that are not custom built).
Soo, to sum it up: I would most certainly buy Sherlock lego figures, but PLEASE consider selling them on their own instead of just in sets, i am sure many other collectors would love that as well. From the pictures, I would want ALL of them.