All coins make the same amount of profit per day. People use monitors that monitor profitability and they switch to the most profitable coin to make an extra %'s.
No secret to this. Unless the coin is unlisted and then nobody mines it, but that's a gamble.
I don't get the "jump to mining the currently profitable coin" technique... seems like over time that would be less profitable because it relies on ability to mine coin faster than the difficulty rises with the value, and that's an ability most people don't have unless they're using large mining operations or have lots of cloud hashing power.
How many coins you can mine in how much time on your hardware seems to be the most relevant factor in deciding what to mine, then you calculate how much profit the coin you can mine the fastest will net you for that period of time based on the current difficulty trend in order to determine whether it's worth it over time or not.
It makes no sense to mine based on what coin is the most profitable to sell on an exchange, that's only immediately relevant for those who already have coins to sell. If you're still trying to mine that coin rather than exchange it, the current price, while indicative of future trending value, may be entirely wrong in determining what coin to mine in the present. The value and difficulty will rise and fall long before you have a chance to sell unless you're selling the same day you mine them which also seems like a bad strategy for a coin with a rising value (which is presumably what's happening based on the initial premise of this method).
I guess a sucker's born every minute though.