I think deciding if you can use it is irrelevant. I can use allot of expensive things that I cannot afford, and in some cases, end up not actually using. I make do with what I have. I find my money spending problems related to hypomania start out this way. It is the kind of money you are spending in a short period of time that warrants consideration. If the initial purchases lead to additional significant purchases soon after, this would make me doubly concerned about hypomania. It is not the actual items purchased, no matter if you consider them appropriate, but the velocity of money through your fingers. Once that bridge is crossed, additional spending can get out of control.