I think the main reason people object is because they can't see any other purpose for most of these crossbreeds than making money and most of us on here object to that as being the primary reason for breeding any dog.

Yes, purebreds orginated from crossbreeds, but there was always a purpose behind the breeding. All the crossbreeds that you see with these designer names seem to be purely with the intention of making money from them.

10 years ago no-one would have paid the same or more for a first cross than they would have for a pedigree - it seems to be the fancy names that are being given to these dogs that are making people by them and many of the purchasers don't really understand what they are buying.

Yes, I understand the thinking behind the labradoodle and if the breeders carried on breeding labradoodle to labradoodle (chosing only those with the traits that were supposed to by why the cross was introduced - e.g. no shedding coats), I personally wouldn't have any problem. But most of the labradoodles you see advertised are still first crosses and as such have no 'breed standard You have no idea whether they will get the coat of one or other of the breed, same for the colouring, same for the temperement.

Don't get me wrong, I actually quite like crosses, I had only mongrels growing up, but when people don't actually know how the pup is going to turn out, I can't understand them paying £100's - why not just get a cross from rescue?

I bet if people stopped paying what I think of silly money for these crosses, most of the breeders would stop -IMO they are not in it for the love of the breed.

Yes,the established breeds we have today came about as the result of crossing different breeds, and after many years of breeding and careful selection standard types were arrived at, but this was not without great cost. Many dogs that were produced and proved not to be 'to type' were culled. This is why it would be practically impossible to produce a standard type for a new breed these days.
Established breeds have discernible traits that makes them suitable for different purposes/people. The new designer breed have no standard type/ discernible traits and for me there is no legitimate reason to purposely cross breed dogs, there are plenty of established breeds /accidentally bred/rescue dogs to choose from already.