Because PL doesn’t support the camera I use most - see the very long wait for the promised support of various phone cameras, despite the promises of DxO staff that it will come ‘soon’ - I haven’t upgraded PL beyond PL4 Elite. It supports the DSLR and (most of) the lenses I use.
That means that to get PL7 Elite, they expect me to pay the full price.
I did get PL5 with Nik. That gets me a discount, but DxO want our money without supporting the cameras most people use most often, they need to charge us less not more.
(I still hold the hope that many various makers of Adobe alternatives merge. Each is really, really, ‘better than Adobe’ good at some bit of the photo editing process, but different bits of it.)