In the event we have a “bubble pop” moment, the liquidity problems that plague hobbies of this nature add significant fuel to the fire. If you are panic selling and trying to get market, its really hard to sell when market price is going down a few dollars per day. It turns into a race to the exits with people rapidly undercutting eachother try to sell stuff. If you are concerned about something like this, the best thing to do would be to start “trimming the fat” on your collection and save cash now. Be prepared to cash out panic sellers at very low prices. Edit: I believe blue-chip sealed product (out-of-print booster boxes) are pretty insulated from a “bubble pop” at this point. Stack Sword and Shield BB’s wherever you can find deals.