In reading newspapers from the 1915 period, I discovered that the $2 ticket price was the top price for a ticket in some of the premier theaters which showed it first. For instance, the Colonial Theater in Chicago started showing it in July of that year. The theater could seat 1400 people. The ticket prices were $1 and $2 for the Orchestra, 75cents/$1/$1.50 for the first balcony, 50 cents for the 2nd balcony and 25 cents for the Gallery. This was for evening performances and Sat. matinee. They had one show per night at 8:15. “Other” matinees were about half those prices.
I found an ad for the December, 1915 showing in Modesto(CA).
25 cents(500 seats], 50 cents(400 seats) and 75 cents(200 seats).
The Chicago theater was taking orders for tickets four months in advance. At least, that what their ads said.
So, the $2 ticket price was paid by certainly less than 5% of all the tickets sold. I doubt that you could use a higher average figure than 75 cents.