Thanks for the response. You state as much in the FAQs.
I will show my ignorance here but see if we can make some headway.
Your own token doesn't have to be fungible with other tokens so it doesn't have to be worth anything.
The cost of mining therefore is just the time and electricity which you would charge your users for.
So my question was around user cost,fungibility of your token and added stress to the Bitcoin blockchain.