I don't know why bittrex is adding these coins.
There are lots of interesting coin that should be added in Bittrex.
People will go away from bittrex if bittrex do these things regularly.
It's a very "safe" project for bittrex to list. It has such little risk to be placed into question by the SEC to be considered a security and it does have somewhat of an active community. It's definitely not even close to one of the more popular ones, but it's one of the few that have absolutely nothing to do with financial markets or dividends. There's probably several other reasons, but that's my theory.