I am pricing out a flight from LAX to TPE for November. I use United's web site and search for economy class, but with fare class to W. The web site returns with the pricing of $1395.10 for LAX-NRT-TPE and TPE-NRT-LAX (NRT-TPE-NRT handled by ANA of course)

All four segments are W fare. I see the usual panel show up to entice me to choose "flexible fare for $7.00 more". The supposed benefits are

* Lowest-available refundable fare
* Fee-waived same-day flight changes (when available)
* Change fees and cancellation fees may apply
* Advanced purchase may be required

So my curiosity is piqued, and I press the button to select the option to take advantage of the "flexible fare." Then the panel disappears, my fare goes up by exactly $7, all of my flights remain as W fare. So here's where I get confused. What exactly would I get for $7? The fare code didn't change, and as far as I know, W fares aren't refundable.

Is this just another one of the not-quite-as-funny United IT glitch? Or some subtle differences in W fare vs. W-fare-that's-$7-more that I don't know about? What if I select the $7 option and want a refund? Would I get very far with my screenshot that promised refundable fare for $7 more?