Clearly there no definitive rules regarding driver/ crossover/ cabinet costs & final sound quality. As I was discussing w/ friend recently regarding another subject, this general principle of economics usually holds true:
You don’t always get what you pay for but you don’t get what you don’t pay for.
If you really want a speaker that has full frequency extension ( or close), has full body tone / richness, has nice open clarity, can image at least reasonably well & can fill a decent sized room w/ true dynamics at realistic sound pressure levels, you gotta pay good money for it. This likely means at least $10 K on up & if you want a finely finished “ piece of furniture” cabinet, you can start at almost double that & end wherever…..
If you’re willing or need to sacrifice any or some of those attributes, there are speakers for less that can be quite good in many ways.