Do you have wifi at work or at home or both?
Do you make alot of calls on the road, at work or at home?
Because even if you use alot of minutes, if there is a wifi connection where you make a majority of your calls, or if you have a strong LTE connection, you may not use all those minutes at all. I use my phone at work but we also have landline phones for our building. I'm not a hermit and I do go out and more and more restaurants, malls, stores have wifi. It's getting to the point where my wifi "list" is huge and I can go in the restaurant and have wifi connect and I don't have to use any minutes..Today is the 21st and I still have 100 minutes remaining. I'm on the $30 ppd plan/100 talk minutes/unlimited text/unlimited data (5gb cap at 4g speeds). I use Google Voice with Spare Phone app.
This plan isn't for everyone but alot of people could benefit from it without realizing it.
The huge downside to all of this is that in May 2014, Google won't allow these types of apps to continue using Google Voice. (At least it is prepaid so I'm not locked down to a contract
)