Apply minoxidil to crown even if not thinning?

[winkywoo]

So, I'm a nw 2, and I'm not sure if my crown is thinning or not. Some days I think it is, some days I don't. I've posted pics on here before and people have said no.

Anyway, what I'd like to know is would it hurt to apply Rogaine to my crown even if it's not thinning? I mean, if it's not thinning (which like I said I'm not sure), it's going to go eventually. So would it be good prevention? I'm already applying to my hairline.

Thanks!