Yeah, the idea is for people who want an immutable keyphrase to contact me for some sort of contract where they ask for a specified amount of time for the keyphrase to stay constant for some reasonable sum of money.
I don't see what possible reason a person would have to pay for a keyphrase? Most people use sites like tinyurl to send links to friends, why would I pay for a service like that? If I was a company, I would just buy a domain with that keyphrase (e.g. www.keyphrase.com) or do something like companyname.com/keyphrase
I think a better monetization plan would be to load the long url link in an iframe and put ads on the top of the page.
This trend should increase with the proliferation of mobile web browsing; typing a domain name is a pain, and I hope to make browser plugins for each mobile browser that capitalizes on this new development.