Yes it is, we have no way to send an order to checkout that would initiate auto-recurring payments, and even if we could, our system has no useful way of handling subsequent payments after the buyer's initial checkout anyway.
You may wish to investigate PayPal's Recurring Payments solution, which is what we actually use to manage subscription payments from sellers for the use of our own services. That sets up an automatic payment schedule in the payer's own PayPal account, instructing PayPal to send us the same amount every month, so we just passively receive payments and IPNs to keep each seller's account active for another month.