is it wrong to withold a source?

I want to add that I do not have a B&M that stocks Opus nearby and the shop 2 hours away marks them up pretty good. So someone taking a good source and marking them sky high and reselling is touchy for me. In fact, I have paid way too much for Opus before because I could not get them any other way. Whereas, I have met some great BOTL here and on other boards that have sold to me at MSRP plus shipping. So to me, it benefits the whole community more when people protect sources.