>> As of July 2015, there are at least 522 known cryptocurrencies,
Realistically: sort by popularity in descending order and keep the top 3.
>>tens of reliable cryptocurrency exchanges
...until exchange will either get hacked or owner will ran away with customer's money...
>> and a growing suite of services specifically facilitating financial operations in cryptocurrencies
These are great business models.
Just like selling shovels to gold diggers - never fails during the gold rush.
