Most of the mailing lists named above have little to no wait, and are well worth trying.
There are some that do have fair waits however:
William Selyem, Rochioli, Cayuse, KB, some Napa cults have large, established followings, and they tend to be expensive.
Kutch, Rivers Marie, and Rhys have tiny or very limited capacity.
Carlisle I would call a value list, and that has created huge, loyal demand - although the wines no longer appeal to me personally.
Of the lists i’ve named above, I think only Cayuse and Rhys will command an aftermarket premium - maybe some KB and RM bottlings too. Apart from KB, I’ve been on all the ones I have listed at one time or another, and while I still own wines from all but Cayuse and Carlisle, I have sold some quantity of wine from ALL of them except Rhys. Usually at below purchase price.
Based on my experience, go ahead and sign up for lists with long waits if you like, but drink widely from what you can get in the short term. You may find that over time you want to drink wines from other parts of the country and the world. I did.
I assembled a largely Cali based collection, though luckily I started branching out way before reaching 1500.
But at 1000 wines, I had probably 800 from California. But by then my preferences had started changing considerably, and this created a problem that I am still resolving. I have sold over 400 bottles of California wine, and at this point cut my buying to only Rhys. And yet my cellar is still 1/3 from California.
Calling it a problem is relative I guess. I do still enjoy the vast majority of wines I have not sold, and can go ahead and sell what we won’t drink before it goes over the hill. To a certain extent we are drinking up Cali, while our other wines mature. So it is fine really. But my one piece of advice would be to drink more widely across the world before accumulating 1500 bottles of (largely) CA mailing list wine.