Another point w/ looking at a pricing that's in flux: if prices are changing markedly over time, and you're tracking those, showing the plot provides information.

As in: is the trend downwards (my expectation), upwards (would be a surprise), or perhaps varying (market showing major shifts). And by how much.

A comparable concept is the bug burn-down charts the Debian project has produced over the past decade or two, which hugely assist with getting some sense of when "when it's ready" might be.

And sure, wrap the information in all the "this is not a price committment" language you care to.