I also advise cutting on superfluous expending, but I do it because of the difficulty of earning money.
Say that you save $5 per day for 200 days a year (probably you do not buy at Starbucks every day). That is $5*200=$1,000. To make that same amount in a bank at 5% APR, you would need to invest $20,000!
If the Starbucks coffee is not adding real value to your life, making your coffee at home equals having $20,000 investment capital.