The "Lock It In" Tactic

The "lock in your one time price now and avoid any monthly fee..." strategy tells your prospects that if they purchase your product now, they will avoid paying an ongoing fee to

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use it in the future.

If they are remotely interested in your product, they'll likely buy it right away because most people hate reoccurring fees. You could even give them a date when you will switch over your product to a subscription product.