Price is an interesting discussion... But like OneOunce, Zippy and others said - there is more to it than just the parts - durability, reliability, etc.
In my opinion, Beretta and Browning have been the "reasonably priced" O/U's for a long time / now unfortunately today, that means guns priced at $ 1,750 - $4,000 probably. But the rationale I use, is will a shotgun give me 100,000 shells trouble free / or maybe up to 250,000 shells trouble free. Browning and Beretta will both do that - and a lot of the O/U's priced today under $1,000 just can't make that claim based on what I see at gun clubs.
Now the question is whether you need or want a gun that will run for 250,000 shells with no problems. Many of us as "Target shooters" - put 15,000 shells a year thru our primary guns ....but shooters like my grandpa, put 200 shells a year thru his guns (or less ).... so it depends...
But a gun like a Browning Citori XS Skeet, with adj comb - retailing today for around $3,000 is way more gun than 1/10th of a Krieghoff priced at $30,000 too. Does that mean the Browning is underpriced ... the Krieghoff overpriced ... maybe some of both ...I don't really know. But what I do know, is most any of the Brownings or Berettas will give you a 250,000 shell life with no issues. Now there are better guns than either out there - including guns like Perazzi, Blaser, Kolar and Kreighoff.... are they worth the money, that's really up to you ! Some of the expense of the upper end guns is the upgraded wood, engraving, etc - and some of its mechanically in better triggers, better barrels, better steel, etc ...