Why some project demo feels like a first date

Based, on the feeling i have now, because will meeting with a client, with a prototype,

1) First impression is important
2) You need to touch up before show up
3) You need to make sure everything works as planned
4) Elaborate preparation is needed
5) You don't have to feel good, but you need to look good(the program anyway)
6) Thing will never works well.
7) you might ends up getting a long term commitment
8) or getting ditched within first hour..