This graph is only for the mid-level players like me (lv 28), so no solar power or Bitcoin lv3 is considered. I am assuming that you have either Bitcoin lv1 or lv2, so the maximum number of GCs only goes up to 25 in this scenario. Also, I am assuming that the game will wipe in 3 months (90 days) from today (1/20/2021).
The graph only considers graphics cards (or crafting costs for graphics cards) and fuel costs along with the Bitcoin price which are:
-Graphics Cards: 840,000₽ (or 313,000₽/3day to craft)
-Fuel: 155,610₽/100fuel (you can buy the metal fuel container from Jaeger lv2 at this price)
In the graph:
-1 GC: 1 graphics card is purchased (840,000₽) from the beginning and never add more.
-13 GCs: 13 graphics cards are purchased (13*840,000₽) from the beginning and never add more.
-25 GCs: 25 graphics cards are purchased (25*840,000₽) from the beginning and never add more.
-Combination 1: First graphics card is purchased but the next 24 graphics cards are crafted at the intelligence center every 3 days. Currently, the crafting cost for the graphics card is 313,000/GC and it takes about 3 days to craft (technically 2.42 days, but I rounded up for an easy calculation). It reaches 25 GCs on 72nd day.
-Combination 2: First graphics card is purchased and the next 24 graphics cards are either purchased or crafted from the profit you make off of Bitcoin farming. It reaches 25 GCs on 31st day.
-Combination 3: Only purchase graphics cards from profit you make off of Bitcoin farming. It reaches 25 GCs on 41st day.
TLDR; Bitcoin farming is good even for mid-level players now, so get your Bitcoin farm up asap. Buy the first GC from flea market, and after that just craft GCs at your intelligence center that way you will get consistent profit 350K ₽/day in average until the wipe day.
I will post my Excel file somewhere if you guys want to see how I did the calculation.