Depends...if you get something like a Andrew Jones Mofi 888 for 5k, you may get some drivers that are superior to off-shelf anything...and you won’t be able to make them for $50 or $100 if you have to do the r&d from scratch.
Keep in mind that most commercially available $5K/pair speakers are equipped with tweeters and woofers that would retail for somewhere between $50 and $100 each if they were sold piecemeal by Seas, SB or Scanspeak. Typically, less than 25% of the street price is what went into building those $5K speakers. And don’t be fooled by those who claim their in-house built drivers are superior. They are often inferior to off-shelf drivers if anything.