If you like what they put out, sure.
Oh, you were just talking about money. Nevermind then.
Maybe he was, but I wasn't.
See, the trick is, lore has never been the primary draw for me for buying a book. Lore is, by and large, the lowest priority because, I know, beyond a shadow of a doubt, that I won't use most of it. Give me a book of lore, and I might use a page or two, and then it's off into my own stuff, either drawing on other sources, or going my own direction. Like I said, a major element of my current campaign is the Shining Citadel. But, the sum total of lore for that is about a paragraph. All the stuff that I've added - I'm going to assume my players aren't reading this - that the Shining Citadel was a weapon used to destroy the Primordial Zargan (borrowing lore from WAYYYYY back, but, also some 4e goodies I found when perusing the wiki about the Dawn War), created by ancient beings in collaboration with Asmodeus and Vecna.
Now, none of that is remotely Forgotten Realms canon. And, the notion that I'd need to buy a 20 year old, out of print, 3e book just to FIND the only piece of Forgotten Realms lore (well, Shadowfell lore to be exact) means that I would never have done this in the past.
But, what's the point of adding yet more lore here? Filling in the blanks? Piling on yet more stuff?
See, changing mechanics makes sense. We play the game, we, as in all the D&D gamers playing the game, use the mechanics and problems or issues get identified. If enough people are having problems, then, well, we go back and rework the mechanics and send out the newly revised mechanics into the wild to see if they survive. So, we get slimmed down caster stat blocks because enough players are having difficulties with caster stat blocks that make them hard to use.
But lore doesn't work like that. Lore is sticky. It's forever. Put something out in the wild and it must never, EVER be changed less we disrespect the canon. Lore is valued for its place in the history of the game. So, we cannot ever change lore without massive reactions. And, because lore is almost entirely subjective in its quality, any new lore is automatically rejected because it didn't come first. All putting out setting book after setting book does is paint creators into smaller and smaller corners because heaven forbid they change anything. Doesn't matter if the changes are good, bad or in between. All change to lore is automatically bad.
I totally do not blame WotC at all for being up front about not being setting material creators. They've basically washed their hands of it because it's always a losing proposition to even try.