I think the title says it all.
For me, in the moment any recreational or entertainment activity starts looking like a job, you should search for something else...
So I will answer a secondary question to your first one:
What in PS is worthly entertaining and fun?
It depends, I don't know why, but some people have fun killing a spawnable mob several thousands of times to max a certain skill, while others stand hours and hours pressing a shortcut to dig gold, and others keep swapping for hours and hours ores from a container(furnace) to other(stock casting) and vice-versa, while others like to press buttons, practice timing and pray for luck to have the random combat system dices help them on duels with very little of actual action and convincing animations(instead of going on a CTF/Deatmatch/etc on another genre of game that is infinitely more tailored and interesting for combat.). Nothing wrong with all of this, as long as you find it fun. Once you start seeing it as a job, you should immediatelly stop doing it(It's no wonder that there are people - farmers - who are hired to level characters in certain games... for most at least, levelling is like a job). Now others like to use imagination to go beyond the limitations of an alpha game engine, but sometimes they go too far as well and become godmodders, having fun at the expense of others just like PKers or of realism(even though I don't believe realism should work to hinder gameplay, but on the contrary, to improve it and make it more fun).
