I have so much old barn dismantling to be done it's not funny. Most of the barns I've looked at are white or red pine siding, oak or white pine beams, floors, rafters, and haylofts. Maybe some hickory

The big problem here is finding a buyer. The Amish fellas are willing to buy it at a decent price, but they are nearly impossible to get in contact with. The non-Amish sawmill owners don't have the time to deal with you, want to buy it for nothing, or are impossible to reach by phone or email, or are back-logged (no pun intended) with other work. The big city guys want you to give them the wood for nothing, give them the address so they can flash some dollars in a old farmers face, or only want to buy small quantities.

My problem is, where the hell do get rid of this stuff in large quantities without killing my profit and be able to pay my guys to pick these barns apart? The things they could do with this wood is amazing when
you finish it as flooring or faux beams. Any help would be great, I have passed up a ton of these for lack of a serious buyer.

I have no idea what the beams are worth, but I've heard they can can fetch big bucks.
The T&G boards may be worth something, depending on general condition (are they free of rot, etc.?).
In my experience, salvaging T&G boards is the most difficult, because of the high risk of tearing off the tongues and grooves when prying them off on at a time.
Try this: Lift the first T&G plank enough to allow a Sawzall blade under it, and slice the nails with the Sawzall, remove plank and repeat.
Of course, there's always the cat's paw method, though that may take more time, unless you can get more workers with cat's paws and prybars to pluck every nail, then you can just pick the planks up and move on to the next stage.
Old wood in decent condition is always worth something; the question is, is it worth your time? If yes, do you have time?
You said the planks are nailed every 5 feet. Do you mean 5'-centers? Like in the beams spaced 5' center-to-center? If you don't have/not worth your time to do the Sawzall or cat's paw methods, here's...
Another idea: Using circular saws, cut the planks along both sides of each row of nails, giving you a multitude of 55"+ long planks, then remove the remainder of the wood and the nails from the beams.
55"-long T&G planks may not fetch as much as longer ones would, but there's still an opportunity to make some $$. Even if at just a few cents per lineal foot, it beats paying to get rid of it.:yesway:
Give it a Splat!

I agree with Wolf on this one. I think a few years ago it was more feasible and profitable.