The main problem you would have using DSL is cable modem bandwidth will be shared normaly at a contention ratio of 20:1 (20 cable modems to 1 upstream size) I.E. 20*256kbit connected to 1*256kbit upstream pipe so the datarate would be hosed for your customers.
ISP's normally buy clear 1:1 upstream feeds (more expensive than shared)
Also, although you could run 10 normal phone lines, you need to run a server box with 10 normal modems hanging off it (how it used to be done before Lucent PM3's and Cisco RAS devices became availiable) or find an old USR total control that allow single lines to be connected . You won't give better than 33.6Kbit dialup (due to it taking signals at analog level, 56kbit needs digital connections) For that you need an access server like a Cisco AS5300 or Lucent PM3. You also need a radius server and scripts if you are going to be giving free webspace and stuff.
It's a lot of work to earn a measely 20 buck fee compared to selling porn!
Good Luck!
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