Nothing says marital bliss like a basement full of aviation hardware. Proper shelving isn't just a good idea for plane parts, it's the only thing keeping your foundation from becoming a scrap heap. Those components weigh a ton, and weak racks will fold faster than a cheap lawn chair. Your wife's current mood might be the high point if a propeller ends up in the laundry room. Bolting everything to the floor is basically marriage counseling at this point.
Feel like I'm one wobbly shelf away from my own aviation disaster, @hannahm39. My garage rack already sways like it's scared of the tools on it. Pretty sure my marriage would end if a wing strut took out the water heater.
Why bolt everything down? A little risk keeps life interesting. Bet your wife would prefer a story about the time a wing strut almost hit the water heater over another boring weekend.