I have 2 dogs (one boxer x male and one terrier x male) and I think that they are 1.5x the trouble, not double the trouble of one dog. They entertain eachother, wrestle, tug-of-war, chase and snooze together.
We have a garage with a doggy door out into a secure kennel run for our guys when we are away for long periods. If we are away for shorter periods we still crate them.
I understand your frustration though. My two dogs are both rescues, and the people I got them from could care less about who I was or how I was going to treat the dogs. This past year I have been seeking a boxer bitch from a reputable breeder and they ask for A LOT of info. I jokingly asked one breeder if she wanted a criminal records check. She said, "Yes, sometimes we do ask for that."
I am a full time student, but I am home most afternoons and some mornings. This is appealing to the breeder, but if I am going to be able to afford a purebred dog, much less feed 3 dogs and 2 cats and MYSELF I do have to work. ARGH! I just can't win! I finally found a very understanding, trusting breeder who is willing to co-own a little show bitch with me. I think she understands that I truely love and care for my dogs and I have to work to provide them with the best possible care.
I understand that breeders want what is best for their dogs and want to see them go to good forever homes. If you are ABSOLUTELY sure that you want a boxer, and you are 100% aware of what you are getting into why don't you get together a list of impeccable references to hand out to breeders. Also, why not ask them a whole long list of questions as well. Not only would this prove that you are serious about this and well informed, but it will give you some insight into how reputable the breeder really is.
Oh ya, and also, when I am home 90% of the time my guys are either sleeping or playing together anyway.
Best of luck,
Tamara