It really depends on how much you ride and when I was commuting 10,000 km a year on bikes that I might have put $400.00 into that were and continue to be ultra reliable my cost per km was very low.
A man has to eat and although you do eat more when you are more physically active you also benefit from improved mental and physical health... and a healthy diet does not have to cost a fortune.
When I was riding 10 k a year I was also spending 8-10 hours a day wrestling with steel and had to eat 4000 calories a day just to maintain weight and by upping that to nearly 5000 calories was able to gain some needed mass.