From a professional perspective I would make a couple of observations about cupboards.
Doors make a big difference. Cutting some mdf, sanding the edges (hopefully) and painting them is completely different to building them with rails/stiles/panels from scratch.
Drawers are expensive and can be very expensive if they are custom sizes in wood. Push to open drawers are especially expensive and time consuming to set up.
Paint finishes vary in durability and quality and this is a big part of the overall cost if it's done well.
In short what I'm seeing with the more reasonable prices attached are wardrobes that are made in the least expensive ways.
How many linear metres of joinery are you looking to do? A rough figure of £1k a linear metre used to be a ballpark and seems to align with the above examples. No idea on 2022 rates.
From a professional perspective I would make a couple of observations about cupboards.
Doors make a big difference. Cutting some mdf, sanding the edges (hopefully) and painting them is completely different to building them with rails/stiles/panels from scratch.
Drawers are expensive and can be very expensive if they are custom sizes in wood. Push to open drawers are especially expensive and time consuming to set up.
Paint finishes vary in durability and quality and this is a big part of the overall cost if it's done well.
In short what I'm seeing with the more reasonable prices attached are wardrobes that are made in the least expensive ways.