Questions have been raised about the wisdom of expanding the program at such a rapid pace.
The majority of customers who have bought Dash buttons actually haven't bought into the program, The Wall Street Journal reported earlier this week, citing data from Slice Intelligence.
Only 48 percent of those who bought a button actually pressed it to place a reorder, Slice Intelligence spokesperson Jaimee Minney confirmed to the E-Commerce Times. That figure was based on purchase data from the firm's panel of 4 million online consumers.
Those who have used the service haven't used it much -- only making a purchase every two months or so, according to the WSJ report.
Based on those figures, Amazon appears to be investing heavily in a program that is not catching on at a pace that justifies the cost.
"Dash buttons really make no sense," said Mike Jude, a program manager at Stratecast/Frost & Sullivan.
"They are a dedicated transaction enabler. They only work for one product, and there is little security in the system," he told the E-Commerce Times.