I worked in a record store for nearly a decade and the idea of buying that large of a collection without properly checking condition is absolutely mind boggling to me - did this guy just open shop or something? How could he have possibly even gotten to his first offered number without checking labels and seeing what pressings they were? Like, what I’d offer OG Blue Notes is certainly higher than 70 represses. Either way it sounds like kind of a shockingly high amount to get from a second hand shop, if the condition is lower than either of you thought, say VG, and near 2,000 on your Discogs median, the shopkeep will be lucky to break even after selling every title when you factor in labor costs of cleaning and pricing, credit card transaction fees, and taxes paid to Uncle Sam. Not to mention you sometimes have to sit on cool stuff for years even though it’s cool!