Many customers are extremely price sensitive and cannot afford cost of a T1 which can be as much as 20 times more expensive than a DSL connection (although prices have come down drastically in recent months). Residential customers who are most sensitive to price should not consider a T1 circuit unless then have a business reason to pay for such a circuit and cannot access DSL service. Most people don't realize that a DSL connection can be just as fast as a T1 at 1.5Mbps. The shortcoming of DSL is that it is oversubscribed. This means there is a finite amount of bandwidth available and a customers speed can drop if other customers in neighborhood decide to use their service. SDSL (Synchronous DSL) is a business class DSL and is ranked as a higher priority than residential DSL or ADSL (Asunchronous DSL). This means it is not oversubscribed to extent than ADSL and is subject to fewer bandwidth restrictions.

In short, if price is your critical factor go with DSL. If reliability is critical factor purchase a dedicated T1.

However, should you find that billing your customers is what you want to do, find a provider who can help you do that. Your hotspot kit should come with software that will enable you to take credit cards right over your gateway (the page users 'see' when they try to access web using your hotspot). You'll likely partner with that provider in that revenues would be shared by both you and "them". Thae provider you choose will make sure hotspot is running efficiently. This allows you to focus on your key business and to receive a profit-share check each and every month your customers log on to net in your hotspot.

The above is a simplistic description of what you'll need to think about before becoming a WiFi hotspot. Do your homework along these lines and you'll have a decent foundation to make a good business sense decision.