Not to make this more theoretical, but dont you have to account for the free energy too?
If you are buying shards, you are buying all 330.
If you are farming then you need to be fair and account for all 330, not just the ones you are paying for.
Even if you are talking about a combine effort of which is the better use of your crystals, you need to consider the other stuff dropping and in the short term the guaranteed shards vs average drop rates.
Just a thought.
This seems a little over simplified to just state it's more expensive, when there are a lot of other factors and it's only 10 difference. 3300 crystals is only 1-2weeks of a top 5 arena finish and you get stuff on that farm you cant get elsewhere.
