If you think about it, grabbing a coffee (about 1-3 while you're at a Starbucks) is pretty much equal to the amount you would be spending at a coworking space. ~$4 each cup of joe and you may have even have three of those a day to avoid looking like you are loitering.
Productivity at a coffee shop is not as great as it can be at a coworking space. With all the noise, distractions, limited deskspace/work area, set hours, you may find that a coffee shop can be very restricting.
A coworking space is professional yet casual. It is social and always encourages collaboration and engagements. For the Hub, a desk starts off at $250. You get 24/7 access to the space, a dedicated workstation and reception service.
When you are able to focus and get tips/opinions from people around you, you get better results which means you more $$ in the long run! You also don't have to worry about leaving your stuff and letting a stranger watch it just because you have to go to the washroom.