I think it is a natural curiosity for new owners and what better place to ask than a room full of Yorkie Lovers
There are as many questions about color on here as far as I can tell....I haven't been on here very long but so far I haven't seen anyone get the opinion that their Yorkie will be bigger and say "OMG I'm going to have to take her/him back"! Maybe there have been but I haven't read it yet.
I think too that many of us (well at least myself) came to YT having a misconception of what is "small". 5-7 lbs. sounded big to me when I got here but after meeting people with 5 lbs. Yorkies they really are "small". My own perception of size has changed since coming here. I have a 3.5 lb 8 month old and hoping she gains another 1/2 lb or so. At this point I'm smitten and don't care how big she ends up...lol