Basically, you are wrong.
First That will work if you find cpu based coins (and you don't mention it). Nice block rewards (as you said) means nothing if the coin isn't listed yet in the market, and that's not for OP (that new in the mining and need to get money as fast as he can). And your way doesn't decrease the risk related to mining using a laptop.
SecondThe GPU mining really gives no profit, but using laptop in my way - you can find several blocks with nice reward.
What can I say?

-------------------------
That's also applied to every mining device when you were solo mining started when genesis block launched (and I assume that the coin just mined by a few miners)