All this illustrates Google's Achilles' heel. The company is great at creating cool stuff ordinary people use for nothing. It's not so good at offering valuable products businesses will pay for. This is true across the board, not just in the area of payments. It also applies to the cloud, where the Google Compute Engine continues to trail Amazon.com's ( AMZN) AWS badly.

Apple may have taken its eye off the ball for a while, but Google has a weakness investors should be considering carefully. When are these people going to learn how to sell something? Considering that investors are paying more than twice as much for Google earnings as for those of Apple, I'd call that a bigger problem.

At the time of publication, the author held shares of Apple and Google.

This article is commentary by an independent contributor, separate from TheStreet's regular news coverage.

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