Online targetted advertising is basically the current established way to find those people who actually would care about your special cheese grater and start to get your business going. If you're looking at alternatives those would be either untargetted online advertising (incredibly inefficient, only people who don't care about cheese graters would see your ads and that's your $5000 down the toilet) or real world advertising like... Door to door salesmen? Or take out fliers in your local newspaper? That's what people used to do
If you feel cheese graters are useless and somehow deserve to remain unbought, then replace it with any other item which does match your bar for utility value.