It depends on what SSD(s) they use and what interface it uses, and what R&D costs DJI feels they need to recoup, especially if the chassis for the SSD and non SSD versions are significantly different which would require another set of tooling/molds, etc. M.2 SSDs in general vary a lot, some have built in DRAM, the cheaper ones do not, and that is a big difference. The type of flash storage (TLC, MLC, etc.) has a significant effect on both cost and drive endurance/longevity as well. Secondly if they use a PCI 4.0 interface (not necessary though for the bitrates) it would also make them more expensive. And lastly, anytime you get a computer component installed by an OEM, it is going to be more expensive than what you can find for that individual part elsewhere - just look how Apple price gouges people for example, sometimes charging 3-4X retail for basic component upgrades like SSDs and RAM. I wouldn't expect DJI to be different.
Also, the Cine price includes the
smart controller, two complete filter sets, carry bag, etc. all of which DJI can charge for even though many of those things are incredibly high margin. So the increased price isn't just for the SSD(s), should that rumor turn out to be true.
If the rumored prices are true, and if they sell the
SC separately, I think a popular thing to do will be the fly more combo +
SC and then pick up some filters or whatever else you need separately for cheap.