1. Some people ask for a discount, saying they're going to be long-term customers, they're going to blog about us all the time, and it's going to be great. 95% of these end up not being long term customers, and do not end up blogging about us all the time.
2. Some ask for a discount, and say (or imply) they'll go elsewhere if they don't get it. My thought is if a few bucks a month is the deciding factor, it's going to be hard to retain them in any case.
3. Some are polite about it, and just ask if there are any discounts available. They're going to subscribe anyway, but wanted to make sure they're not passing up a good deal.
I almost never offer one-off discounts any more, and very rarely offer any kind of public discount offer (and it's always for a limited time when I do). When someone asks I point them to our referral program, and to out partners who may offer a bundle discount on our product if you subscribe to _their_ product.
The benefit to this approach, in my mind, is that no one ever feels like they got ripped off because they had to pay full price - there aren't any public discounts available, so pretty much everyone pays full price.