Give him the pen, then sell his mailing address to a paper manufacture.
Then cap his refills at 1 per 3 months, but for a low monthly subscription offer to give him all the ink he wants, and all the new pen models as they rollout.
Hard selling of ubiquitous consumables in highly competitive markets has no place in the SaaS world.
How hard is it to cancel? What does the price tiering look like? When you are acquired, will I still receive my shipments?
All of these are arguments for why the "subscription market" is absolutely bogus
Cancel? You can't, you can only revert your account to the unpaid plan.
We also reserve the right to take our pens back whenever we want.
Now, we could setup a special "enterprise-level" plan for you, with onsite production, dedicated management, and pen and ink manufacturing which you'd own after you paid off the terms, but that'll be a bit pricey.