we use it to waste time, so that we die quicker, and the funny thing is we use it on our selves and others...the time lords need do little else but sit back and watch us self destruct. they've done it many times before you know, destroy planets that is....in fact they were much like us at point in time. they were invaded by money too, but they overcame it, found ways to defeat it. but they still bear that seed of evil money left behind.....greed.
so they visited other planets as the battles of wealth had left their lands dry.
but the planets that had the resources they required were populated with four limbed five fingered beings, much like themselves....so just like others before them and others before the others they planted the seed of money to destroy the local inhabitants.........