I owned the base game from years ago and hadn't played.
So in the recent sale, I had a choice - for about $40, I could either buy the Morrowind/base game for $10 and Summerset CE for nearly $30, or I could buy the 'black box' with standard game/Morrowind/Summerset and all DLC. I didn't want to get ESO+.
So, it was a choice between the Summerset CE bonuses - mainly a nice mount and pet - or all the DLC. The mount and pet looked nice so I got the CE instead of the DLC.
Now playing - and even if I want a nice mount, the recent promotion included one so this is mostly for one nice pet - I realize the DLC is nice to have, and priced it out. Looks like 21000 crowns, which is $150!
So, I have a $150 pet if I were to buy that. That basically sucks.
It's hard to see the best way to get the DLC now. Even with a black Friday sale I heard about, if crowns were half off, that'd still be $75. Make more sense to re-buy the game and Summerset to get that black box next time it goes on sale for $40 just to get the DLC, making it a $40 pet.