I also do all my working from the local university library. I have a very hard time concentrating from my home office because being in the house can become too distracting. I never have a hard time motivating myself to get up in the morning and go to the library, it is really nice to walk the mile there each day.

I just don't see the co-working space as necessary, and since the library provides almost the exact same amount of services for free I really can't justify it. I have considered paying for a private office, but it kind of feels silly to pay for something that is halfway between and office and a library. If you really need to get a office with an address, just go all in and rent an office!