That's an easy one...... they find out how much money you have and spend it for you until it's gone!
Being kinder, the choice of how SP your engine is... is down to your budget.
However, it's an example of 'diminishing returns'. Selecting the best parts out of a batch of 10 may give (as a guess) a 2% imrpovement which may be worthwhile. Increasing that batchs from 10 to 100 will give a 2.5% improvement over standard, thus only 0.5% better than from 10. That's still probably worthwhile. Expanding that to 1000 may give 2.55% improvement over a standard.... thus only 0.05% improvement of a secletion of 100..... is THAT worth it????.
The numbers listed above are NOT supposed to be accurate: the concept contained therein... IS!
Ian
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