Because the overhead costs would be enormously higher than a traditional restaurant to produce far inferior food?  Because you have no demonstrated ability to design the kind of complex machinery needed to prepare anything more complicated than Spaghetti-Os?  Because your budget to design and build a robot restaurant is based on nothing and almost certainly drastically underfunded?  Because your proposed location has already proven unable to sustain an upscale restaurant?  Because your entire business model is high risk / low reward?  

Pick one of those.