Whilst obviously market forces, supply and demand dictate prices; I personally would say that for reds anything below £2.50/kg is not worth pursuing, and £3.50 for Roe. When I say pursuing, I mean it in the sense of bothering to sell it vs keeping it, or pursuing it to create revenue. However, the issue is that few stalkers shooting decent numbers will not be able to consume large amounts of venison, so are forced to accept the market prices.
I suspect the bottle neck on venison supply arises from a mix between local stalkers not bothering to sell due to low prices, and commercial stalkers/contractors running out of deer to sell, and that the likes of highland game have captured most of the commercial venison sales in Scotland contractually at fixed price/qty agreements.
If instead of stalkers operating on a lone wolf basis, would start conducting culls with neighbouring estates in joint deer drive efforts, esp on fallow (being very transient), this would not only deliver more venison, but help solve the fallow overpopulation crisis. Picture 3-4 farms / estates arranging a deer drive with 30-40 stalkers in high seats, instead of them shooting a couple of fallow on a lone wolf basis, in one day, possibly 50-100 could be harvested: then left to rest, and repeated a month or two later.
However, the issue with the above is people are very protective and defensive of their stalking, and not willing to engage with larger deer management groups to arrange local deer drives as a community approach.