I got one as well, around the same time actually, as a gift. I also fell into a strange fascination with it and find it fun to hold in the exact same ways as the author. Folks tend to get me 1" element (or sometimes non elemental but interesting in another way) cubes as gifts now which works out as it gives a great range of price to choose from while maintaining surprise with the guarantee I'll enjoy it.
I've had my sites set on something this size https://midwesttungsten.com/tungsten-cube/ for a while now. (about as much as I would feel safe setting down or handing to people considering the hard edges and chance of accidents) I've more than had the spending money to do it for a long time but much like the author I've just had a hard time justifying it. I suppose it's still less ridiculously than what many spend on car hobbies or whatnot. I'm sure I'll eventually get something of the nature.
I'll also add I was extremely surprised others enjoyed it as well. Of all of my desk toys/models/prints it's generated the most talk amongst friends and coworkers.
I'd like to experience a sizeable amount of iridium some day as well.
Edit: One of the most fun gifts I've received (beyond the tungsten cube) was a 1" magnesium cube. Apart from being a ridiculous fire/blinding risk capable of easily melting through the tungsten cube if set off it is even lighter than an equivalently sized aluminum cube.