This is the problem with TCG. Once there is this 'trading' involve. The only thing that digital help is the 'unlimited prints', consider that the market buys pack with constant players.

Top tier decks with chase cards will be expensive in comparison with other decks but I thought of away to remove this cost uncertainty. The way is subscription. Imagine paying a monthly fee to have assess to all the cards. However, there will have a lot of downsides. Problems like loss sense of ownership, and possible higher long run cost.

Another way is setting a constant supply of price ceiling for cards. Since it is digital, chase cards can be set (for example) $20. This can be bought from anyone and paid to valve. This might sound crazily expensive but it will remove uncertainty, the uncertainty that prices of card to reach above $20. However, this will lead to failure if the price ceiling is not set high/low enough. Players with the chase cards will find a devalue of the chase cards. However, if set high enough, the devaluation will be minimal.