Scarpozzi,
Please know what you're talking about before posting. DSL is NOT like Cable modem in that respect. Your notion is mistaken. I don't know where you came across that info, but it's incorrect.
DSL is much like a T-1, except that the ILEC (Incumbent Local Exchange Carrier) doesn't give a rat's a** about repairing a consumer grade line. DSL is dedicated copper into a DSLAM (Digital Subscriber Line Access Multiplexor). Providers must, these days at least, have a DS-3, for transit from the DSL provider to the ISP (sometimes they're one in the same, but most times not). Then it's all about the ISP's backbone and their connection to the Internet backbone.
The only difference here b/w a T-1 (DS1) and DSL is that there's transit from a "last mile" provider to the ISP.
That's much different that cable modem, where users are all connected into a common node in their neighborhood, then transported to the Internet backbone. That neighborhood node can and does, easily, become overloaded.
Granted T-1 is MUCH more reliable. However, your argument about "A T1 line would guarantee it and you could have your own domain name..." is again mistaken. Most providers today offer both residential and business DSL service. One of the big differences being the ability to serve. With business service comes static IPs.