Can you imagine what it was like for the first vacuum salesmen in 1910? It took a very special woman with a very unique relationship with her husband, to buy a vacuum cleaner. First, she didn't know what a vacuum cleaner even was, until the salesman showed up at her door. Second, she would have been HORRIFIED at the amount of dirt it removed from her 'clean' rugs. Third, she probably couldn't call her husband to ask permission to buy a vacuum, (he wouldn't know what one was either). The salesman wasn't waiting around till the husband came home, if the housewife said "no" he moved on to the next house.
To say to the salesman "I'll take it", was a rare day. All she could do was sign the purchase order, and the bill was sent to her husband. But, when he got home, she had to tell him what she did. Can you imagine the argument that entailed? The Hoover, with tools, in 1910, was $85. More than a range, a sewing machine, and a third the price of a car. She didn't have any income herself, and had no checks. He had thirty days to pay the bill. She had thirty days to 'encourage' him to pay it. Again, a unique relationship 'coaxed' the money out of him.
That's one of the reasons it took SO LONG for vacuum cleaners to 'catch on' with the public.