Continuing with probability, with 1400 crystals, never spending over 100 crystals per attempt, you could buy 18 energy refreshes. This equates to 2,160 energy or 216 attempts for salvage.
Running the binomial distribution for n = 216, p = 1/6, the most common outcome is 36 pieces of salvage at a ~7.27% likelihood. The chances of getting 50 pieces from 216 attempts is ~0.325%. There is a 98% chance that this will get you anywhere between 25 and 50 pieces of salvage.
Going to only buying the 50 crystal cost refreshes, so 2 per day for 14 days, now you have n = 432, the most likely outcome is 72 pieces of salvage with a likelihood of ~5.14%. The chances of getting anywhere between 50 and 100 is 99.86%.