Rolla Huff, the CEO of Internet service provider EarthLink, has made a choice many in Silicon Valley find incomprehensible: He's no longer bothering to get new customers. Here, the moment you stop growing — no, the very second your momentum falters — you're instantly written off. But the reason why EarthLink swung to a $54 million profit in its first quarter was simple. Its new dial-up customers — yes, people are still signing up for dial-up — simply weren't worth its while, and EarthLink stopped spending money to market service to them. Huff has also pulled the company out of the municipal Wi-Fi market, selling some networks to city governments and shuttering others. He's similarly disentangling the company from its Helio cell-phone joint venture, a half-billion-dollar fiasco. All of that doesn't leave EarthLink with much of a future.