On the one hand, old beech and maple trees, provided the wood quality is good, already bring in more money than a boring spruce, and then there's the new price per m². I believe with beech, for example, the root system is also interesting because in luxury cars, some kind of dashboard trims are made from it. But it could also have been oak :)
It is hardly possible to sell a single tree from this stand to a wood processing plant; at best, you might get firewood out of it, because:
1. First, no forestry worker will come by for a single tree unless it is a hazard felling. Then, theoretically, you get €100 for the tree, but the felling costs €1000.
2. But nobody will pick up this single tree to take it to a wood processing plant, because the minimum transport quantity should be at least 10 cubic meters – better 20 cubic meters. So, you pay another €100 to deliver a tree worth €100 to a wood processing plant, whose felling already cost €1000.
3. Even if you managed to gather a truckload together with some neighbors, the quality would be far too poor and it would at best be processed into pellets, etc., and on top of that,
4. ... you have no certification for the wood from this stand, and
5. ... almost everything in this forest consists of edge trees and was additionally more or less used as a forest garden. No wood processor will accept that, because if someone nailed a fence to a tree 50 years ago and the saw blade hits one of those nails, the machine will be down for several hours.
Ergo: hope that no windthrows occur, use it as a forest garden, and if wood falls, best carry it directly to your own fireplace or give it away to neighbors. Everything else is unfortunately absurd in this situation, so no huge sums should be paid for it.
Best regards
Dirk Grafe