IMHO, it's not a matter of what my time is worth when it comes to homebrewing, it's a matter of what i like doing, and what i don't. It doesn't matter that i spend a few hours brewing a batch, i enjoy that. It does matter that i spend a bunch of time cleaning up after brewing because that's no fun. So, I look for ways to reduce cleaning time, and don't really care about reducing brewing time right now. Cleaning and sanitizing a couple cases of bottles
seems like a chore I wouldn't enjoy. I was lead to believe before I started homebrewing that kegging takes less cleaning time, but honestly, i don't know, I've never bottled a batch, and I have no interest in doing a time study on it.
So, my decision to keg is based on
perceived convenience, since my belief is that both kegging and bottling produce good results, if slightly different. It has cost me considerable money in kegs and draft beer hardware, and I think a lot of people who spend that money convince themselves that they're spending it to get better beer. Personally, I stopped trying to justify personal purchases to myself a few years ago. The only justification I need is that I like what I buy. I like my cars, I liked my house, and I like my draft beer setup. In general, I'm a happy guy.
If at some point I don't like the draft beer system, I'll sell it off, like I'm trying to do with the house.