The most I have spent on jeans is 150 on a pair of Hugo Boss. Best fitting jeans I have ever bought. I usually go with DKNY jeans. They run anywhere from 65-90.
Like others have said, if they fit, are comfortable and make you happy, go for it. Same with cars. Do you really need a 40,000 BMW when you can buy a 12,000 Civic.. HA!
BMW, please get rid of the RFT's and give us a spare tire!