Buying an Airline Ticket On-line, Great Upgrade Price...Not!

So recently I was looking for an airline ticket to Europe--something without an In-Flight-Entertainment box blocking under seat room, two-across seating, not three (goodbye BA and IcelandAir). Seems that Delta/KLM and Lufthansa are the only ones who offer that. So I went further in the process and as part of it Delta put this ad into my screen...an upgrade? Oh, boy check this out! Maybe a good deal headed your way!

Round trips to Amsterdam from Seattle next Spring are running in the $1300 range for economy.  Here's the ad:

A screen shot of a pricey upgrade option

So with this ticket, for only an ADDITIONAL $1,980 I can change the ticket to one that's refundable! Whaaat? Or maybe I should just upgrade to Business Class, where I can get a real seat, where my shoulders don't hit the man in the next seat.  Gee it's only $2,324 over my ticket, that's pricey but....wait a minute...that $2,324 EACH WAY?

So my $1320 ticket becomes a $5700 ticket.  Theoretically, I could buy four adjacent economy tickets, then lie down the whole trip (both ways), treat myself to a $400 meal in Europe, and come out even.

I guess the algorithms aren't quite perfect yet, huh?