General Qs on SE Algorithms

In a search engine algorithm, it occurs to me that there could be 2 ways of measuring the value of the input factors. The algorithm could be constructed so that each factor (title, links, PR, etc.) has a maximum value (i.e. X/100) or, each factor could be conceptually infinite (i.e. factor=X).

Let me describe each of the two scenarios more clearly for those who may be confused - I'll use an exceptionally simple algorithm:

Scenario A: Maximum Values
Page Title Score (PT)/100 + PageRank (PR)/100 + Link Building Score (LB)/100 = Total Score

In this example, the maximum score is 300. The site with the most points scores first. Here, one could not optimize beyond 100 for any value, so once a perfect Page Title, PageRank or Link Building Score is achieved, there is nothing more to do.

Scenario B: Infinite Values
Page Title Score (PT) + PageRank (PR) + Link Building Score (LB) = Total Score

In Scenario B, the highest value wins, but there is no limit on points that could be earned and no maximums for any of the factors.

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My questions are:

1. Which do you think the SEs use? Maximum values or Infinite Values
2. Do you think it's dependent on the factor - i.e. Page Title score might have a max value, but link building does not?
3. Do you think a maximum is calculated based on the highest value found - i.e. the page on the Internet with the highest PageRank, etc. is given a 10 and all others fall in below?

The questions are interesting to me, because it would provide an answer about whether there is an artificial ceiling for optimization.