But it's true, you have to leave a PC running all the time to watch the market. How to get around that? 1) Buy a Beagleboard or Rasberry Pi, install Chrome, and run that (maybe 5W power vs 60-140W for normal PC). 2) Maybe modify the bot or create another one that can be run on a cloud server.
That's the reason why I build Gekko. I personally use it on my VPS which is on 24/7 anyway (for a couple of bucks a month). But you can also run it on a raspberry or similar. Gekko doen't have the overhead of the whole browser Chrome (doesn't even need gui, runs fine on my ubuntu-server), etc. Also it's extremely easy to daemonize / keep running for days.