...
$100 in 1960 is like $1500 now.
an entry level rig would cost $500 in 1960 but today it costs $500.
Soooooooooooooooooo, WHY has (by your own numbers), the ARRL membership cost increased at 15 times the cost of a radio over the same period of time?
Yeah,.................. postage, 
Because inflation doesn't apply the same way to electronics. Look at computer prices, or TVs, or just about any other electronic doo dad. Generally, capabilities increase while cost stays the same or goes down (numerically speaking ... once inflation is factored in it goes down even more).