Why Don't More People Collect Washington Quarters?

I mean, yeah. Of course not. A lot of coins that people collect generally can't be found in circulation, though.
They can be purchased obviously.

There are many coin series that can't be found in circulation.
I collect both Buffalo and Liberty nickels, which generally can't be found in circulation, at least easily.
But I guess the silver aspect in the early years is probably enough to put off most people.

I see it the opposite way..... For me personally, I have little to no interest except for errors perhaps in modern coins. They're overproduced by millions, see them everyday in change so the interest is just not there for me. They will have just face and value. They will be a hard sell because no one needs them since they're pretty easy to acquire.
For Washington quarters I really just have the 1932, 1932-s, 1932-d and a few silver ones here and there from metal detecting. I would only keep the ones that I found metal detecting because it was a challenge in acquiring them. That would be true for the Roosevelt dimes as well. I would only want the ones I dug up or found at a coin star or perhaps even just a toned set. But to each their own. I would never tell someone not to collect them if it interests them. But, I would think the ease in acquiring them still in circulation by their mass productions would be a turn off to many, Plus, if one isn't getting the best of the best, then the chance of them going up in value is slim to none, except for the older ones and errors.

I forgot. I do have all the State Quarters. A person I used to work with knew I collected coins and gave me his set of State Quarters someone gave him as a gift...He wasn't a collector and had no interest in them..so I took him out for lunch before he took a new job elsewhere for payment and to wish him well.

I have a collection of Washington quarters--not a hoard necessarily, but a collection.

Maybe a blessing and a curse? Being able to fill holes easily and consistently may help keep younger/newer collectors interested. Of course you are right though that the upside potential is fairly low, aside from the appreciation of silver.

I'm working on an uncirculated set of Washington quarters in a Dansco 7140 album. I had to buy the album used because they are hard to find. Assembling a circulated set is easy, but a BU set is much more difficult. I've found dealers don't have many of the early dates available, and even finding problem-free common dates is surprisingly difficult. The demand definitely isn't there.

It could be that the recent quarter series (State, ATB, and Women) take up all the oxygen for modern collectors, while those focusing on classic coins look to SLQ, Barber, or Seated quarters. That leaves the standard Washington series out in the cold.

Yes. They are nearly impossible. They sometimes pop up on ebay, but are normally used or brand new for a ridiculous price.

There are a couple right now on ebay, but have some issues due to being used.

On the website I normally buy Dansco albums from, the proof only album is of course in stock but not the 7140. Really annoying.

Noooooooooo. I refuse. Lol.

I don't mind so much the proofs, but I don't really like diving into the expensive silver proofs.