I understood michaels post more as "keep buying DLC and skins from the frontier store to give us 100% of the money".
As it stands, right now steam doesn't sell any of the current in game 'DLC' (ship skins) or any of the merch, as such I strongly doubt they're legally taking a 30% cut from frontier's own shop (and even more so doubt that steam would be legally able to raise the 30% steam 'tax on stuff like mugs and Tshirts at all).
I feel like OP totally misunderstood the situation. Yes, if you buy future DLC over the steam storefront steam will take their 30%, but I'll need some more proof that they will take a 30% cut from frontiers own store other than some random guy on this forum claiming so.
I personally linked my accounts for the added download speed (there has been word that apprently the updating will be done through steam; though I can't personally say if that's true), the implementation (I use steam as a main form of communication among gaming friends and as such have it open 24/7 anyway; the slight bonus advertisement as I passively show everyone oin my friend list is a nice bonus, and yes I actually have been asked about the game because of that and made recommendations), and some less important things like the "hours played" counter, mostly because the game itself doesnt give that kind of functionality.
And before anyone starts throwing bitter words my way: I fully plan on buying every possible extra content over FD's own storefront, despite everything I do still believe in supporting the dev first and foremost.