Haha ok this may offend some but deak with it punks!

So anyway, i have been noticing that my INTp and INFp friends are very economical (shall we say) with their finances/budget *ahem* cheap *ahem*. I have my ideas on why i think this is the case (perhaps a thing) but i was wondering if you guys either: a) noticed this with yourself or others INTp or INFp or b) have any theories on why this may be true?