I don't live close enough to a fly shop to regularly shop at one, so I am limited to online shopping when I need stuff.
It’s just odd. And smells like dollars and cents are behind it, as with most things in life I guess.
I liken it to the car market. The margins for manufacturers, and thus dealers too, albeit to a lesser degree probably, are higher on loaded up, high trim models, especially pickup trucks.
When you go to a dealer all you see are higher end models with lots of added packages on them. If you want a base truck, you can still get one, in theory, but you pretty much are forced to special order it. And then the dealer will kick and scream about using one of their “allocations” on a cheaper model with less of a profit margin, and try to upsell you into something more expensive, if they’ll even order it for you at all.
I had this happen when shopping for my commuter Avalon a couple years ago. I wanted a base XLE model with the V6 engine. Everything on dealer lots were loaded up Limiteds with the hybrid engine. All of my local dealers, including one who I’ve bought several prior vehicles from, told me they weren’t going to burn an allocation on a base model Avalon when they could make more money with that allocation on a loaded up one. Or better yet, a loaded up Tundra or Tacoma. One told me they’d order one, but they wanted a $5k markup on it, to make it comparable to what they’d make on a Limited. And then of course tried to push me into buying one of the Limiteds they already had on the lot. I of course walked. Ended up having to go to Maryland to get one. Hopefully with Covid issues waning and dealers starting to get overloaded with overpriced high end inventory that isn’t selling, some of this nonsense will begin to correct itself.
Back to fly lines…I don’t know the exact reason DT’s are becoming harder to find. But I’m pretty sure it has to do with profit somewhere along the supply chain. “Oh shoot, I need a new fly line, and want to fish today or tomorrow, so I don’t want to wait for one to be shipped.” All they have is WF’s in the store, so that’s what you end up buying.
I’m not a good enough caster to notice a huge difference between WF’s and DT’s for various applications. Nor do I really care. I just know I get way more usable life, and thus save money, with DT’s.