In reply to Greasy Prusiks:
I would say there's a few reasons why I climb. First would be that I simply enjoy climbing, regardless of being indoors/outdoors, whether there's a good view, or maybe it's a shitty little indoor wall. I enjoy it all the same, in fact I enjoy the dingy indoor walls more than the long outdoor trips since I can climb until my body simply can't pull anymore.
There have been a few times where I've gone out trad climbing and just found myself bored, because I'm not climbing! I dislike standing around, putting gear in, climbing a max of 5 routes a day. I much prefer to be indoors smashing out 30+ routes in a few hours. Probably quite controversial on ukc, but that's just my opinion. (Also yes - this is why I chose my name :p please don't take it as a serious insult or something). I do appreciate that others enjoy trad and the long adventures, but I simply don't.
I also love to see improvement in my climbing, sending projects that were previously impossible for me, etc. This pushes me more towards bouldering, as it's easier for me to train for bouldering! Of course when it comes to grades, it's nice to climb a higher grade, but it's 100% relative to what I personally find hard and easy.
Another possibly controversial opinion, I climb alone as much as I climb with others. In fact some of my most enjoyable climbing has been on my own, with an audiobook, just training. Sure I love climbing with others, but I also appreciate a bit of solitude from time to time. Another reason why I like bouldering! It's either that or free soloing, which... Well I've done it once, but I should probably avoid that.