It's simple. You have a 0.5% chance of getting a lego from Ancients & Voids. There are currently 123 legendaries that can be pulled, 33 are Voids. Of these there are a number of legos that just aren't good. Your chances of pulling a lego and pulling a good lego are ridiculously low. Add to that a "mercy system" for which they refuse to allow any way of tracking but takes more than 200 shards to start and you have yourself a system that isn't compatible with low spending.
I refuse to spend money on this game. If they reduced the mercy system, especially for the almost impossible to get void shards, if they put a mercy counter up for us to see where we were at or if they allowed us to pull a champ we needed vs getting some random garbage lego or worse a duplicate (seriously, I have 19 legos, 7 of which I didn't pull but fused, got as log in or won, so 12 pulled I have 2 dupes already), if they had something like that I might spend money.
Of my 12 legos that I actually pulled I have gotten 3 of the lower tier/borderline bad legos, King Garog, SkullLord and Wurlim. It really isn't worth spending money. I'm just casually waiting for a decent champ, if I don't get one to progress I just play less or I get to spend time on another game.
As for Cirilla's comment, loosely translated it means if people could trade their duplicates for unique champs then they wouldn't spend money. The "unexpected consequences" for balance means balancing the budget and nothing more. There may be ways to get shards but unless you have a really good UNM CB team (need shards, tons of luck) there is no consistent way to get shards except spending, they made sure of that by taking the Sacred shard you get once per month for login away.
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