I want to buy new speakers for 50,000 and see it used for 30,000, what should I do?

The business of new vs used is difficult. 2 yrs in a speaker life is NOTHING.

Speakers sound better with use. Short of abuse, no worries. 

But i would insist on hearing them in person, inspect for physical damage, make sure the mfr crates are in PERFECT condition, and either transport them myself if practical or ship with insurance. 

1st flip on most anything in a 3rd party sale is 50% off plus maybe a little wiggle room. Is the MSRP 50K? Is the person the original owner? Warranty transferrable? Original purchase receipt available? 

Do your diligence on such a large purchase. Nothing sells for the full MSRP these days, and if you bite, your problem becomes his ex problem.

Reading these responses, I also have to wonder whether you are trolling.

My therapist tells me I have trouble making decisions.
 

You’re making it way too hard and overthinking this.  Seems like you’re going to have regrets whichever choice you make.  Pick a lane, don’t look back and enjoy your speakers.

Just get reasonably nice speakers and enjoy them.

Spend the extra money and enjoy live events and hear music properly.

Nothing beats a symphony orchestra. Not even $100k boxes that might sound 25% better than something 90% cheaper.

imho.

Am I crazy or the rest of them are?

Do you really asking this forum for an advise of how to spend $50,000.00 on pair of speakers?

Do you realize that most of the opinions you’ve got is from members whose entire system cost less than that, and they should be asking you for an advise instead.

Anyway, it’s your money - do as you wish. However, at this level of pricy equipment, you should be knowledgable enough to decide for yourself.