Making your own models with real bricks from Bricklink (and other parts platforms) is
SERIOUSLY expensive. Of course it somewhat depends on the colors, some bricks are very rare in certain colors and can cost up to € 10/pcs, though I usually stay clear of those, and I use a lot of black in my models because that color is available and usually a little cheaper than other colors. (plus I like it)
The most non-rare expensive parts that add up quickly and make your creation very expensive is, interestingly, large plates, large and large technic beams, which are sadly necessary for the kinds of models I build (for the frame of the racecars).
You can calculate approx 20-25 cents per new unused brick, so a creation of 1000 parts can easily cost 200 bucks. I have a lot of spare bricks and usually I can cut down costs buy using some of those, but its always very expensive. Compare that to the LEGO F40 model that costs around 90 bucks for 1000 parts or so.
When I buy the parts I always feel bad because of the price, but in the end, with the assembled creation in my hand I realize its always worth it. Making something you designed on paper/in your head/in computer and make a physical model out of it is amazing.
Also from all the models you have posted,
@Nessy , the James Bond Lotus just has to be made in real bricks, its really good. 👍