1. No, I do not put emphasis on the percentage of letoff when buying a bow.
2. It is their club and the members make the rules...sounds like a democratic system since everyone votes on them. Personally, I think there are many, many other variables both related and unrelated to equipment which play a much bigger role in harvesting a world class animal and they should be given more emphasis.
As for comparing a high percentage of letoff compound to a crossbow.....
....if the " weapon" locks the string at full draw and/or has a stock then it is a crossbow. If it doesn' t have one or both then it is a compound. Simple enough.