This current iteration of ED has been out since about 2015 right? My gut feeling tells me that the majority of ED players do not have it in Steam but bought it directly from Frontier. I think ED has been on Steam for only 2 years or so.
I bought ED Horizons on Steam in Feb 2016. Cost me $30.36.
Pretty sure this was my first purchase and I didn't buy ED first and then Horizons...Nope... Bought ED for 14.99 on Dec 25, 2015
So a whopping ~$45 for 2,215 hours of fun...
$0.02 per hour..
Whole thing On sale now for $14.99