How about awarding some XP bonus points for taking a jersey? KOM, Sprint, any Course.
+100 XP once per day for each jersey won?
A little extra motivation to get that top time.
So what happens when people use the world hack and get a jersey without really trying?
Also, only a very small percentage of users ever get a jersey.
@Nigel - I’ve never actually tried the world hack. How many riders are typically on the “off calendar” worlds? I would imagine there are at least a few at any given time. So you’d still have to work a bit to get the bonus points for winning a jersey.
If it’s not points something else; it’s not easy to get a jersey and I think it would be nice to celebrate it or recognize it a bit with more time, points, badges or whatever 
Zwift for life!
Good idea, but it’s only greater incentive for monkeying with one’s numbers a/o trainers.