If a Model T Ford in 1915 costed $390, or about the same as a very low-end Victrola, then Victrolas were very, very expensive at the time. A house in 1915, at $3,000, would work out to about 4.4 years salary for the average person in 1915, which is about the same as today; (with the average income in the U.S. today being $73,290, that would put the average home price in the U.S. around $322,476 (4.4 years x $73,290). That is pretty close to the average home value today, (except if you live in California
. That reasoning works out fairly well for cars to, with the average a new car costing about 6 months salary for the average person.
So, maybe there was an even greater disparity between those making an average wage in 1915, and those who were well-to-do. There might have been a lot of wealthy families around who were buying Victrolas and Model Ts.
(Sorry if I got any of the math wrong - I was an English major!)