Vicki, that's what a lot of us who are on Rootschat really enjoy doing - helping others to break down a brick wall or find that elusive person. It is often surprising what a fresh pair of eyes can find. You certainly aren't taking advantage as that is what Rootschat was founded for, to help each other. Most of us started by asking for help and then found that in return we could also help others. All we ask in return, as Susan said, is a word of thanks.
Personally, I would much rather ask for help from people on here, some of whom are very knowledgeable and know exactly where to look, than rely on family trees from other sites where they may not have been researched properly.