I would definitely be interested in some form of 'gardening bot'. This but at a smaller scale just for my garden.

At a smaller scale, I can sow the seed myself. I can harvest myself. What I do need automated is the areas where I consistently fail when trying to grow my own vegetable patch. Watering is the main one. Just having a sensor to detect when to switch on and off the hose pipe would probably save most of my crops. Slug control would be another - something to detect when a slug gets to close and zaps em with (preferably) a laser.