ok, this will be my first post on this board, after lurking for a while, thnx for some good laughs now and then
The answer is pretty easy:
1) money - I've been doing this for exactly 2 years and in 1 month I make what equals 9-10 months of my former income (and I wasn't flipping burgers

. I expect it to raise quite a bit in the near future
2) the low initial investment in relation to the possible future profit, you can hardly find a biz which looks more promising, even now, where everybody says the market is oversaturated. I'm building 10 niche paysites together with a friend right now, and I expect the initial investment to be equaled out after 3-6 months and from there it's profit only (I hope, pray pray), show me another biz where this is possible (no pimpin' for me
3) Time; you're right the initial work is pretty hard. I worked 10-13 hours 7 days a week the first year (but I did so on my other job anyways). But now I can keep my income stable with 10 hours work a week and improve it by doing more than that.
The last 3 months I haven't touched my sites or anything, just building the paysites, which will be launched in a month or so

and yet I've improved my income every month, which means when you reach a certain plateau, you suddenly have time for trying out new things, without having to ask your boss or loose income.
You're definetely wrong about the autopilot thing. If you work the SE's you can be on autopilot for quite some time before it bites your ass.
4) besides all that it's quite funny to generate traffic, think out sales pitches and experimenting. The only thing I hate is the repeating tasks, which you have do a billion times (doorways, avs-fronts, submitting galleries etc.) gets quite boring after a while.

Lasse