Value of beethoven lp records?

We are two professional clical musicians in NY who have put together an *artistically* impressive collection of vinyl, from the 60s to 80s - at which point, we starting collecting THOUSANDS of CDs. We decided last month to sell our vinyl, to make room for more CDs. We databased everything, and are finding that there are a few dozen that collectors will cherry-pick - and the rest will more than likely be sold be the foot. Really - by the foot. That means that performances that will NEVER be heard again, by incredible artists, will go for 25 cents a disc. The cherry-picked are going for 3 bucks or less. I bought an ION turntable, and will transfer some of these - but the task is huge, and I have a professional life to maintain, so very little will get done. It is a sin - but it is the truth. Yes, we have a Sgt. Pepper in excellent condition (bought 2, one to play, one to save) so that will go for more. . . . and over 600 will go for a pittance. Your Beethoven records? They may never sell - ever - unless you want that 25 cents.