Its not rude to ask for those things. Some people may give you good answers and some may choose not to give out their rub secrets. Jeff's rub and BBQ sauce are good. You may want to purchase the recipes. He offeres a money back guarantee if you do not like it. http://www.smoking-meat.com/jeffs-na...ub-recipe.html
Absolutely feel free to ask anything. There are a few members that do competition cooking/catering and may not want to give away everything but even then those members will usually still point you in the right direction.