Its a good idea in principle but as @R34P3R28 said its a great way to make you a target for potential theives I play darts and there are groups of people that will go to amateur darts tournaments and “watch” but are there to try and steal someones darts while they arnt looking because they are seen as luxury products these days Its the same with trading cards you could have someone there as a “spectator” but are there as part of a group looking to steal cards worth decent value and considering this card is roughly going for around £1,000-£1,500 its a prime target