Wow, that's a lot of responses, thanks!
Personally, I feel the problem is with both of us. I hold my hand up to those who have said I am not persevering. Yes, I am not, and nappies are way more convenient. I probably could go the 'stay indoors for as long as it takes, get rid of the nappies' route. But it does not work with how I like to live my life. People will probably call me selfish for this, and with good reason too. That's why I posted in AIBU, I needed to hear the negatives of what I was doing.
On the other hand, I do feel that while DD is happy sitting on the potty in front of the TV for an hour, she still doesn't get the concept of a full bladder, or a poop that needs doing. She will tell me as soon as she's done a poo, but doesn't get that she needs to tell me while or before she does it. I've tried going down the treat route, she doesn't care about that at all.
DH and ILs and my own parents don't get this part. My mum claims that my sister's 6 month old is going to be trained before DD is!!
And I know I will get the whole 'oh, she isn't trained yet, how come' thing when they come to visit. It doesn't help that DD is a tall girl for her age, and people automatically assume she's much older than 2.11 and are surprised to see her still in nappies. DH is no use at all, he works from 7 till 7, and all he wants to do is crash when he gets back. So any training I have to do, I have to do it off my own bat.
The other problem for me is the weather. We live in a city where temperatures can go down to -40. Its very easy to stay at home all the time and get depressed. So I actually have to make a huge effort to get me and DD dressed and at least get out for a couple hours. The house is also fairly chilly, and its hard to leave DD out au naturelle. If DD actually did get to the stage of telling me she needed to go, by the time I got everything off her, she'd have probably made a mess. And I really don't want to be in a position of standing outside in -31 (its that out today) with a wet kid.
On the other hand, it is very encouraging to learn that I am not the only mum with issues regarding potty training. Its almost become a race to get kids trained, and I have seen examples of some very competetive parenting and I don't want to be part of that.
I want to do what's best for DD, and thanks to your very generous sharing of your experiences, I am much more confident that I will be able to do what it takes when the time is right for both of us :)