Let's just say hypothetically that a WO guy or gal (the one in here) were to be inclined to purchase a brand new Lambo with 1BTC, once Lambos were within that price range - or bitcoins were within that level of price appreciation.

How many BTC would you say would be prudent to be in that person's BTC holdings or the level of that person's wealth, more or less, to make it prudent to use one BTC on a lambo?   Perhaps the equivalency of at least 10 BTC?   If you have the wealth equivalency of 10BTC when a Lambo is worth 1 BTC, then you can prudently afford a lambo, in my level of thinking about prudence. 

Of course, other guys and gal might come to a different conclusion than me, and be willing to allocate their value towards a lambo with much less of a value cushion.  Personally, I think it would be somewhat reckless to have less than 5 BTC of value and to apportion 1 BTC towards a lambo.. but, hey that's me.