I should point out that just throwing out a 100 point story over nothing is a bad plan career-wise - you definitely need to be able to back it up with reasons (

I should point out that just throwing out a 100 point story over nothing is a bad plan career-wise - you definitely need to be able to back it up with reasons (we need to interface with systems x, y and z, this is comparable to other system w which took 8 months, we don't have any spec for doing a, b or c). In that sense the 100 point estimate is a real one - a "small" feature (eg. add a form to your web site) might be two or three weeks of work.