Yeah, BMI was originally designed as a basic measure to use as a control in large studies of lots of people. In general people with BMI's of around 24 are healthier than those around 34, etc. But there's very little evidence that any one particular person at a 24 BMI is healthier than one at a 34.
In fact recent longevity studies have found that the group between 26-28 BMI actually lived longer on average than the group from 20-25. (The theory on this is that it's near impossible to control for other risk factors which might be inversely correlated with BMI at those ranges).
Once I got under 200 pounds, the health aspects of losing weight were pretty much solved. It's been vanity weight for the most part since then (though it is nice to feel better after lots of activity). I'm honest enough with myself to say that "looking good" is a big motivator for me.
As for the scale, there seems to be a sort of inertia to it, but that works both ways. You stick to what you're doing and it will start dropping, and in my case sometimes it starts dropping rapidly day by day. Earlier this year when I got down to around 162, it went from like 169 to 162 in 10 days after being stuck around 168-170 for a while. Keep up the good work.