Here's the part worth understanding, because it will shape how your store looks.
The knowledge is thick where a lot of people cared, and thin where fewer did. That's not a flaw in the data. It's what a volunteer archive is.
Well-documented, usually: major-label releases, canonical albums, anything with a large following. If a record has been written about, argued over, and re-pressed a few times, its details are probably all there — full credits, the right year, a proper story.
Thin, often: obscure pressings. Local and regional releases. Records in languages with smaller online communities. Compilations and various-artist collections. Soundtracks. Box sets and reissues, where the edition you own may not be the edition that got documented. Self-released and unreleased material.
So if your collection leans toward the well-trodden, your store will look rich almost everywhere. If it leans toward the local, the obscure, the deep cuts — the records you're probably proudest of — you'll find more quiet corners.
That's worth saying plainly: a sparse record isn't a broken record. It usually means you own something that not many people have got around to writing up. Which is, if anything, a compliment to your shelf.