A guitar listing for eight months to a year should tell the seller something. They should get what they can now before things get worse. We are in for a rocky spell as things get deglobalized. I've seen clean guitars with the old this is new. I bought it three years ago and never played it. Listed at $200 less than really new with warranty. I think that as Yamaha gets their distribution network going, and folks actually get to play them, the used Guild market will rise. Right now I doubt one in ten guitar players has ever touched a US Guild. That is the primary reason Guild has always brought less than their worth.
We have been living in a very prosperous age. Manufacturers , Guild is really the exception, have been finding ways to sell guitars that are, in some cases, thousands more that the base models. The car makers have really been the masters of greed. Their time is coming. Fret not, A D 40T is a great guitar. So is a D 25. Grab them when you can. You can get by fine, like the farmer can keep fixing his 92 Ford F 150.
About the only way you can buy a basic truck is get one when U haul sells off their stock. The big upside with guitars is once you have them you can enjoy them forever. So find that D 55 and buy it now. No mater what, in twenty years it will seem like a bargain.
It's funny, for ten years I've kinda sorta tried to buy a D 18. But when I play them, they are different, but not better than my D 35. Some day the right one might come along, but it's fine if it doesn't. It has to be great and priced right. That's a hard combination these days.