Thoughts on MicroAcquire & Annual Pricing

I'm sure as many of you know, MicroAcquire has seen incredible growth through an annual-only subscription model. I'm curious to hear anyone's thoughts, opinions, or even better, personal experiences with such a pricing strategy.

I have an idea that requires a similar sort of closed marketplace, and working on a pricing strategy. I'm thinking of starting annual pricing between $200-$500 CAD but with the potential ROI of the users and the historical costs of such a service they usually shell out $10k+ for a single deal, so I could justify to myself pricing at $200 per month.

That being said having obvious and immediate ROI to your paying customers (like MicroAcquire), makes acquisition so much easier.

Excited to hear everyone's thoughts.