Well, if we look at your math, you are saying on a ten energy node, you have a 56% chance of get a ticket. We will take natural energy regen out of the equation. For 250 crystals, you can get 4 refreshes a day (3x50 + 1x100). So in two days, you can spend the same 500 crystals. That gives you 8x120=960 energy from refreshes or 96 attempts at a 10 energy node. 96 x 0.56 = 53.76 so 53 or 54 tickets. Additionally, you get the gear from the farmed node. Therefore, if you are hitting the 56% drop rate, using crystals for refreshes is marginally better than buying tickets with crystals.
