Snapshot is free for now, but it won't probably free in future. Quite tough to plan with unknown pricing scheme.
Block storage is only available on NY/NJ region.
A lot of cool features are only available on NY/NJ
Some necessary features are also only available on NY/NJ
While NY/NJ region gives you the full featured solution, the latency is not suitable because USA lies in one corner of the world. People like me want to choose UK/London which lies at the middle of the map for consistent latency all around the world.