Disclaimer: This comment may sound very crackpottish. I promise the ideas in it aren't as wonky as they seem, but it would be to hard to explain them properly in such short time.

By living your life in this way, you'd be divorcing yourself from reality.

Here comes the notion that in posthumanism there is no definite reality. Reality is a product of experiences and how your choices influence those experiences. In posthumanism however you can modify it freely. What we call reality is a very local phenomenon.

Anyhow, it's not the case that your computing infrastructure would be in danger - it would be either protected by some powerful AI, much better suited to protecting your infrastructure then you or there would be other copies of you keeping the maintenance in "meatspace" (Again, I strongly believe that it's only our contemporary perspective that makes us feel that reality in which computations are performed is more real then virtual reality).

What's more, a Waker can be perfectly aware that there is a world beyond her experiencing and may occasionally leave her reality.