If you're using lorem ipsum to communicate pricing ($5/$4.99), how do client even know that's what it represents?

Wouldn't it be better if you put that $5/month and let them know upfront copy/prices are not set - they are meant to communicate what that area is for and how much space is dedicated to it.

What if you had in your mind that the space is for $5/month, but used lorem ipsum and designed around that.

Then the client hands you copy that goes '$5/month, $50/ year, Save $10 if you subscribe annually / 20% off.' This will likely to have an impact on your layout and spacing, since you just used 'lorem ipsum' in the wireframe step.