All but 2 of the robots are worth 25k. One is worth 35k, and the other one is worth either 45k or 50k (can't remember which, haven't gotten it in a while).
And it IS possible for a non-paying player to get a decent amount of points. All you have to do is be able to survive long enough. On my first play through of the
French version of Hammerfest, I managed to get up to the 90's with about 1.3million points (this was before I could consistently get 2mil points). It's possible, you just need to be careful (considering you only have 1 extra life at the beginning).