I certainly made that mistake. About 6 years ago, I scrolled the Baldwins unsold lots and saw a mint state AV 5 Guineas 1794 William and Mary. The price was at that time 12K UK Pounds= 17K Can. Dollars. I did not have the $, was tempted to take a loan from my bank, pay it back later in year. Well, that same coin sold recently for 117K US....made a BIG mistake.