The phrase 'because doing so is' is correct and can be used in written English.
This phrase is typically used to set up a statement that will explain the reason behind a preceding action. For example: I took the bus instead of walking, because doing so is more cost-effective.
Second, you need to decide to do the action exactly because doing so is virtuous.
They enjoy cooking even more now, because doing so is much easier.
But neither company hedges all its prepayment risk, because doing so is expensive and lowers profit.
Finally, Washington's determined promotion of democracy compromises its credibility because doing so is often at odds with its own policies.
"I will never cower before violent intimidation, and stop telling the truth because doing so is dangerous," she said.
You can get thousands of people to sign up for a donor registry, because doing so is pretty easy.
Device manufacturers can solve the problems most easily but have the least incentive, because doing so is expensive, experts said.
Finally, there is much pressure on teachers to teach creationism along with evolution in the science class because doing so is "fair," or perhaps "good pedagogy".
Literacy is associated with many outcomes of research interest as well as with respondents' ability to even participate in surveys, yet very few surveys attempt to measure it because doing so is often complex, requiring extensive tests.
In this payment system, the time-consuming process of cultivating a relationship with a patient is essentially worthless, because doing so is not a finite, billable procedure.
Selling cheese to neighbors is a problem because doing so is a tip-off that the cows are producing more milk than the Government is aware of.
