I'm not going to answer in any phylosphical way.
Just a list of what keeps me motivated:
- The go club I go to, lots of fun
- Being able to solve tsumego I could not before is just great!
- Eye opening concepts, unfortunately they come less and less as you got stronger.
- Meeting new friends through go
- Seeing places you have never been through because of go
- Seeing a crazy move (but good) which inspires you to be more creative in your game.
Actually now I think about it, it comes down to 2 main points:
- Social life around go
- Constant understanding that I do not yet understand but I try piece by piece to fix my own puzzle
Oh and of course one more big motivator is this great forum, maybe you have heard of it...
It's called Life in 19 x 19

Have fun and stay motivated !!!
Otenki