Maybe chickpeas are expensive where you live, or maybe you miscalculated. Either way, take a look at my numbers for comparison.

We can get a 3.63kg bag of chickpeas here for $7.49 (CAD). Assuming you fulfill all your Calorie and protein needs from chickpeas alone (2500 Calories and 150g protein per day), it comes out to about $600/year. That's $1.64/day. In order to be $10/day, you'd have to pay 6x as much for your chickpeas, so that same 3.63kg bag would have to cost $45.50.