I re-reread your post and I can't see a number pad fitting on a 17"... maybe a 20". But then that's just silly.
but you don't have to lug around a huge thing, most number pads are really small.
But if it's a deal breaker, it's a deal breaker, you have the right to your opinion. You definitely have the right idea in sending feedback to Apple.
But I usually choose a company based on their customer experience. My computer has all the specs I need to accomplish my goals as would any other PC or Mac. But I've never experienced the sort of top notch customer care I've received with apple from any of the other major suppliers. if a simple number pad is the deal breaker to getting a very nice well thought out machine, then I have to say, you may be missing out on something very minimal.
Like I wouldn't buy a mac until they made secondary click (right click) avalaible on the mouse. Now I have a Magic trackpad with all the gestures I would ever want on it including secardary click (and a couple ways to have it too)! If enough people are in your situation, they'll do the same for you too!