What most people who do it don't understand, is that it bugs higher level people. Its not only a shortcut: like the dupe item glitch on minecraft (first example to come to my head), but when youve beaten everything, you get bored. The best way to alleviate that is to play pvp2. Then, when you find that every deck you come across is an unupped shreiker rush where the person leaves after waiting for a 70 seconds, or a farm that leaves as well, its a tad annoying. Most experienced players allready have the shards, and don't need electrum.
As someone with over 100k score, I think I count as a higher level person. I don't find it annoying. Back when I was a noob (and had few rares/shards), I didn't play this game much. Once I got into the game, I started playing more when I got more rares. I enjoy making random decks and playing in AI3 or PvP 2 to test them, and it's a lot more fun being able to use shards/rares in the decks. While waiting for the 70 seconds for the CPU to take over is annoying, I really don't mind. Lately, when I've been in PvP enough to know that there wasn't a farm people were missing, my opponent dropped out after 2-3 turns.
Also, while I don't really need electrum or any rares (have 6+ of all), I still like them. Even if I have more than 12 of a rare, I don't sell them because it gives me bragging rights. Same thing for electrum: I have over 40k electrum sitting around that I'm not using for anything, and yet I still like winning more electrum.