I agree for the mst part that a lot of LFSs are in it for the money, and even if they are selling LR and corals, they don't alays know what they should. There are 3 stores here in the Buffalo, NY area (that i am aware of) that all sell stuff for reef tanks, but only one that seems to know what they are doing. What i did to find out where i should go, i spent a lot of time here, and reading some books, gathered a lot of knowledge of the whole reef tank hobby, then i went to the store with a list of "questions". I put that in quotes, because they were questions that i allready knew the answer to, but asked to see what THEY knew. Sometimes i even asked the questions in such a way that they would hafve to disagree with me to give me the right answer. The 2 stores that agreed with wrong information to make a sale do nto get my business now, but the one store that took the time to explain that i was wrong, and why-- they get all my business now. it si a store that ONLY does saltwater, and they know a ton about reefs. they have been very helpful, and have been very enthusiastic about my interest in the hobby. They have also expressed that it is nice to sell to someone who actually takes the time to research and figure out what the heck they are doing first! (they are used to people just stopping in, dropping $2,000 to set up a tank, and then disapearing after a few months becuase they cant keep anything alive!)
Anyway- to asnwer your question, if the place you are thinking of working at knows there stuff, it could be helpful, if not-- you might be better off just reading and spending time on this forum....
Joe