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the performance of the coin is good on the market, but the development team is nothing to brag about, the people behind monero might be too gangster for coinbase to get involved with, but demand for the coin alone is reason for coinbase to add monero. If coinbase is looking to work with professional business people then it will be Zcash, not monero

Zcash devs could double the supply of coins in the system and you would have no fucking clue. Zcash is a corp DOA coin.

Time will tell. I think Monero may have a billion dollar marketcap by 2018, just because it is not a clone based off Bitcoin (which Zcash is at it's core, just heavily modified) and it is actually thriving with no ICO / Centralized development backing just like Bitcoin has done. I may be wrong though, we'll see.

If it's less about politics and more about making money, then monero is the right choice for coinbase

Yeh, Monero definitely makes bank. I suspect it may hit $60+ per token this year with a supply of only 13 million coins right now...would still be under a 1 billion marketcap even at that value per token. The GUI they just released is nice too, I like it. That along with Ring CT going into affect (hides amounts transferred, on top of the address hiding already implemented) its getting very popular.