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The main reason is they have killed Brick & Motar sales, it often cheaper and you can get exactly what you want.
And your ordering from them indicates that your convenience overrides your concern.
You do make a good point (a point I had thought of as I was posting this, hoped no would notice, how long have I been a member?). , Also Amazon are basically the only source for somethings now (I have had a couple of dodgy Flea Bay incidents)