It's definitely been a driving factor. If the GMK Dolch sets become much more available I'd expect these to go for much less.
I don't agree, any GMK Dolch GB or Originative set is well over $100. Most Dolch Pac kb's sell around $160-$180, they have vintange blue mx switches and have a g80-1800 layout. The Dolch keysets won't affect the sale of the Dolch Pac's.
Like other vintage keyboards, they'll only increase in value over time. People actually like the Dolch Pac keyboard itself.
Well at this point it's just a guessing game. There's been some odd things occurring lately in regards to prices for some of these vintage items. And IMO it feels a bit like a bubble. Historically the prices have inched up over the years. But there have been a few sales recently that seemed a bit high to me.
There haven't been any moogle kits for dolch keys in awhile which can make it a harder sale for some. I do know that when the GMK dolch sets became available the auction prices dropped down from $100-120 to around $60-80 for a few months. I took advantage of this and picked up 3 more boards because they're the only good source for vintage blues I've found so far. There's a bit more to that story, but I'm going to leave that part out.
I don't see many people posting their modded Dolch boards often, so I can only assume people are buying these to source for parts. Usually boards that require a converter only appeal to a smaller group of buyers.
Again, watching some of these boards go for over $150, especially on geekhack has seemed pretty crazy to me. Especially when I was watching boards go for less then that on eBay.
A few years ago it was common to see people buying these for the Dolch keys, using their Moogles, and selling the rest of the board in the classified ads. These boards would typically go for around $40.
Also if it gets posted to "great finds" I expect the price to skyrocket, so that's not always a fair indicator of an average price.