Howdy again Sit, James, and all.
Yes, I'll go along with what you say Sit, if I had 2500 LPs, I'd seriously consider some form of machine for cleaning. My collection is nowhere as vast as yours, I have about 425-450 LPs. I am sort of borderline with the need for one. Since I've always stayed on top of my collection, what I have usually doesn't require much work to keep them pristine.
When I do acquire the one, or two oddball secondhand LP's, I'll go to work with both my Last, and Disc Doctor Fluids, and respective brushes. Usually, if I see a used LP that looks too plum tuckered out, i'll pass on it, no matter how badly I would've liked to have it. I figure why try to torture a good Cartridge (And my ears) trying to track a beat up record that looks like someone cleaned it with a Brillo pad? :-)
James, over the years, and in the early days, I probably bought Plastic lined sleeves from Rat Shack, and they were certainly better than the Cheapo paper Sleeves that came with most LPs of the time.
(Mo-Fi's were the exception, they always came with a good Plastic Sleeve)
Ten years ago, when I had gotten much more serious with Analog playback, and the acquisition of a VPI Turntable, I decided to upgrade every LP I owned at that time, to good Japanese Plastic Inner Sleeves, and the great Japanese Outer Resealable Sleeves.
I bought them from the same place I bought my VPI Table from, and that was MusicDirect in Chicago.
Before they were inserted into any new Sleeves, they were all Cleaned with Last, or Disc Doctor Products.
Any Factory Outer Plastic Wraps were trashed, just as the junk Inner Sleeves were trashed also. The only Inner Sleeves you really want to keep, are those with Lyrics, or Pictures of the Artists on them, otherwise chuck all plain jane Paper Sleeves, they have zero value. I'd buy the high quality Inner, and Outer Sleeves in bulk (100 )
MusicDirect usually carries a plethora of many different brands of Inner, and Outer Sleeves, and I'm sure others Like Elusive Disc, etc carry them also.
The Mo-Fi inner sleeves are nice, but also quite costly when you wish to buy literal 100's of them. The Japanese Sleeves usually offer quite comparable quality, and protection at a better price.
I've made a special rack for my LP's, and that is paramount that LP's are stored away from sunlight,heat, humidity and stored in an Upright fashion without being literally packed-crushed together like a can of Sardines.
Some use Milk Crates, and these I guess are OK, but can make LP selection-browsing problematic. Alphabetizing helps when looking for a specific selection, or catagorizing into different generes. (Jazz-Rock-Classical-etc)