I do agree that maybe deco is a tad expensive, but if its too cheap then your base goes from a hump of dump into a beautiful base by day 5!
Also by the way, you CAN mine coins with a gpu rack, gpu and some scrap metal, The more GPU's however (I think above 3+) require coolers, which requires more advanced components, but it can mine up to 100 coins in just the day.
The gas problem is such a real thing, often I run out of gas in 1.5 days, it costs half a day's pay to just refill it. I've counteracted this by just run jumping to nearby towers and saving the ATV for power outages and for those long away towers like Romeo.