I enjoy tinkering, but not obsessively so. I'm glad I can repair most anything I own, and perform DIY upgrades if/when I desire. I've gotten my main system to where I really like it, and did it on a really tight budget. Improvements now would entail more significant outlays in cash, and that's not in the cards for a little while probably. I guess in summary, there are still a few things I'd like to improve, but I'm content to do that slowly. I'm not into making changes just for the fun of it, I'd rather be listening to music and my rig gives me great satisfaction in that regard even if I am still aware of things that could be better.
There are a few things I've wanted to try for a while, but really I have little motivation to get them done. Things like building a small SE amp, or trying to bi-amp my speakers. Other things that I'd like to do will cost more than I can justify right now, like trying ALK crossovers and/or the improved midrange horn he recommends. I've also paid zero attention to my digital front end, and I really should try to make it so I can at least tolerate CDs and other digital formats.