I have noticed my wife has been spending more on herself as well. In her case, I think its because she's felt that she sacraficed so much over the last few years that she deserves some stuff for herself. Don't know if that applies or not, but it might be another possible reason.

Me: 35
W: 31
D10, S7, S2, S11 months
M: 11 years
Tricked into separation.
In Last Resort.

My story:
http://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=1800530#Post180053