Poodlestrike
Banned
Nope. Cryptrach ranks just get you packages in the mail and it claims to affect the Engrams he sells but it doesn't.
Technically, it does at first; you need to be level 1 to be able to buy Uncommon engrams, level 2 for Rares, and (presumably; never actually seen or heard of such a thing) level 3 for Legendaries and 4 for Exotic. That said, there's not much practical difference after rank 1, since even seeing Rare engrams for sale is... well, very rare.