Raven can be accepted on Overstock, however if you can't buy it what good does that do? The entire cryptosphere suffers from the same thing. Buying and using crypto is just too hard right now. It's way too complex for the everyday consumer.
Coinbase made it easy to buy crypto, but once you have BTC, ETH or whatever you need to exchange into yet another coin and incur fees along the way. Who wants to do that when you can just use your AMEX?
Better exchange support goes a long way to helping to address this but there are still hurdles to overcome.
Exchanges will be following the community growth. Raven devs want to have a natural growth process. If raven cheats and buys its spot on an exchange just like many other scam coins do, this will have a negative effect in the long run on the project. I mean whenever coin goes in a bad direction financially, people will be seeking aid from the devs. That's no good.
In the short run I am sure there would be massive pumps if raven was on binance right now but to make this happen, either devs will have to pay huge amounts of money to binance or one of the holders will have to.
Slow and steady is always a better choice for a coin which aims to be a long term project. Crypto history is already full of one time pump&dump coins.
If overstock really has any interest in this project (devs say so, and there is a video about it, you are still free to not believe any of it), community will surely get larger in the future and then exchanges like binance will be listing it for free.