Casual raider here, only 1st boss down in ToT and I can purchase maybe 2 more items, then just wasting VP and even those 2 items will either not be used for my frost gear or will be replaced with T15 set gear. Mages are not like my paladin, where once I have all the Ret gear I can spend excess VP on Prot gear.
5.3 can't get here fast enough to allow us to spend valor upgrading existing gear.