I got bitten by the proof set bug last year. Started with a few, then got a 1955 set, and took off from there. Now over 60 sets, and 7 to go. Including the SMS sets, and one lone 2011 silver set, and one duplicate 2008. Over 560 proof coins in all. It has been fun, and expensive but according to PCGS proof set values, I’ve spent 50% of what they are worth. I’ve been lucky on many of them , as collectors seem to shy away due to the sheer volume. Almost all of them were purchased well below current value including shipping. Some sets are really valuable, and storage of them is an issue. The ones I need yet are 2014-2020. I can’t stop now, so plan to finish my set. If anybody has the seven I need, and willing to part, let me know. Maybe someday, I’ll get the ones prior to 1955, but these are getting as rare as hens teeth. I know of one 1954 set in ogp for $130. The most I’ve paid so far is the 1955 set in envelope and the 2012 set both were $70. I know, it was an impulse thing, but I like knowing that I have every production series proof coin since 1955. I’ve been logging cost, PCGS prices, and retail prices on all of them. I don’t think of selling them, but maybe someday as a massive group. Yes numismatics are crazy.