Many cards in Magic aren’t ever going to be played in top-tier competitive decks. However, in the case of Wight of Precinct Six, this Zombie did see some fringe Standard play at one point. As a creature, he’s actually quite efficient.
A 1/1 Zombie for 1B is pretty bland, but his ability allows him to gain +1/+1 for each creature in your opponents’ graveyards. So once an opponent has 2 creatures in a graveyard, your Wight is already a 3/3. This doesn’t include any buffs from popular Zombie creatures such as Cemetery Reaper or Death Baron. Already, he’s a good card.
Most casual hits are cards that are good in and of themselves. But most of the time, they simply don’t find a home competitively for the long-term. However, Zombies, in particular, are a very popular Magic the Gathering tribe when it comes to deck-building. This is why creatures like Wight of Precinct Six tend to be such good investments. You really do want to have 4 copies of this guy if you’ll be playing him. Whenever you have a card that is best played as a full playset, they will sell much more quickly that cards that you really only need one of in your deck.
On Amazon, Wight of Precinct Six sells for about $1 (as of 6/1/17). On TCGPlayer, it sells for closer to $0.30. The Wight also has two other printings, albeit limited ones, in Commander 2013, Duel Decks: Jace vs Vraska, and Commander 2016. Notably on TCGPlayer the market price - meaning an average of what the card has recently been selling for - is higher than the median for the smaller three printings. This means that the price is slowly creeping upwards due to demand. This isn’t the case with the original Gatecrash version, but that’s only because the supply for that printing is still enough to satisfy demand.
So what is causing the higher price on Amazon? Shadows Over Innistrad introduced a few new Zombies, including Diregraf Colossus and Relentless Dead. Amonkhet introduced quite a few more, including a very good one in Lord of the Accursed, among others. Naturally, with new Zombies to build around, Wight of Precinct Six is being considered somewhat more often. As an efficient creature that gets better as the game goes along, it’s a pretty good Zombie to consider when throwing together a fun little Zombie deck.
Additionally, there are Commander decks that use him, too. Wight of Precinct Six is even better in multiplayer, simply because his ability includes all opponents' graveyards. EDHREC has the Wight listed in about 1500 decks, so there's definitely demand for him. With the Commander interest, copies drift off the market here and there from that format.
If you have copies of Wight of Precinct Six hanging around, be sure to hang onto them. While they have been more than simple bulk for a long time, in the future, this card could disappear in a hurry. Uncommons like this can hit several dollars a copy just from people buying 4 at a time over a number of years. This guy is definitely a keeper.