It's not smart to use a connection you NEED for work or business that is residential grade. You need a T1 or other that has an SLA. Residential is a "best effort" connection and should not be used for critical applications. You get what you pay for. With an SLA they may call you before you notice that the line is down. Trying to go cheap doesn't always pay off.
There's a lot of people that do if they rely on it for mission critical situations. My brother ended up getting one when his ATT DSL failed and he lost thousands because of it.
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I do appreciate your sense of humor though!