You asked "how well" this particular ploy works.... I would suggest that demonstrates a level of expectation.

You even call it an expectation! Then deny you expect it.... lol

Yes.. definitely nice if it did.... no argument there...any free upgrade is clearly welcome!

So...they should grant EVERY request? Or just yours? I'm curious given you say its a customer service reputation matter....and Ive been on flights with MORE than one newlywed couple.... should they ALL get upgrades on request?

I get plenty of upgrades... using upgrade instruments/miles... have not and never will ask for a freebie. Its not about me... youre the one planning to ask for a cabin you haven't paid for.....

Congratulations on your impending nuptials... but realise that to the vast majority of the population it is YOUR special day... not theirs.weddings are extremely common events.......no offence intended...