I agree with this advice.
A couple of years ago I made a list of 7 rules for navigating the hobby of high-end Pokemon card collecting, and one of my rules was not being afraid to pay an all-time high for a card (because it may well be the cheapest chance anyone else ever gets again).
www.elitefourum.com/t/a-collectors-guide-to-the-high-end-pokemon-card-marketplace/17755/1