A product such as this will have very wide appeal even outside the modelling fraternity, despite frequent criticism of the Royal family, there's many many collectors of Royal souvenirs.
Working at Royal Doulton back in the eighties we were all given a Charles and Di wedding mug, horrible thing, I ended up with about six as some folks in my department didn't want one.
I put them in the loft out of the way, about ten years later my neighbour who worked in a charity shop came around asking for donations, I had a look around and spotted said mugs, off they went, a few days later she's back begging for more mugs, they'd sold very quickly at a tenner each.
