You can't judge a speaker based on the price of its drivers.
I hope you're not serious.
At some point you have to realize that cost....is quite a large factor. Would you trust a $20 Vifa tweet over a Scan Illum.? Or the Dyn 110?
If there were 2 speakers that were made from the same company, specialized for the drivers in their cabinets and at the same price...but yet one had $200 worth of drivers and the other had $1000 worth of drivers, which would you choose?
I wonder how much some other companies spend on their drivers.
Most larger companies use their massive R&D to develop their own.
If you can make the speaker cheaper by going to parts express and making it yourself go for. But you also no factoring in labor, parts, design, logistics, rent, advertising, fancy magazine reviews don't come cheap.