Sorry about your butthurt but Coinbase is not obligated to add instamined scam coins like Dash, especially considering how unstable and flaky Dash's code and governance are (comma of doom, InstantSend exploit, arbitrary rebranding, etc).
If Dash can't succeed with out Coinbase pulling its wagon and doing the heavy lifting for Evan, it deserves to die because it's just another useless shit-fork of BTC.
Maybe Coinbase would be more interested in adding Dash if Evan got rid of his instamined coins like coblee did with his LTC .
Regardless, sobbing and crying salty tears because "Coinbase thugs" don't care about your pump and dump dreams is poor form and makes Dash supporters appear desperate, whiny, and over-entitled.