Steam chart figures show concurrent players - the number of players currently playing at that time.So rough extrapolation would mean that they sold 1.1 million copies of ED at 20£ a pop. If only there were that many players in game at any given time. Or even 5% would mean 55000 players. Looking at the chart here:
We are bearly cracking the 10k players, meaning a 1% of players who purchased a copy in 2018 are actually playing the game. And that number doesn't take into account players who purchased the game prior to 2018, making the represented percentage even lower.An ongoing analysis of Steam's player numbers, seeing what's been played the most.steamcharts.com
That's a bit of sad statement if you think about it.
Really? Not everyone thinks it's fun to repeat the same task over and over again. Some people just want to cut out the grind and tediousness of it and skip to the fun part.
So if we assume each player plays for say 2hrs per day we can multiply any given figure by 12 to get an approximation of the total playerbase. Probably that's a pessimistic figure but then Steam players aren't all players so the estimate is very rough anyway
Arguably the trends are indicative of the overall playerbase.