Just wanted to clarify some things. When you originally setup service with DISH Network, the service plan is free for 6 months. You can remove it at anytime with no charge. If you remove the SP and then add it back, then it must be on the account for 150 days to avoid the $25 downgrade.
As far as the original question, being a waste or not is a matter of perception. I personally believe that my peace of mind is worth $6 a month. I have used it three times in 6 months, once for a tech visit, and twice for replacement equipment. With a tech visit ($15 with it, $95 without it), a replacement remote (normally $20 without it now, free with it) and the replacement receiver (shipping would have been $15 without it, free with it), I feel that the money I have spent over the time I have had it (much longer than 6 months) has saved me a little. I could remove it and only add it when I need it, but there are others in my house who use this system and may not know about the SP, or get offered the SP. To me, it prevents headaches, phone calls about billing, and someone hollering that I need to take care of the issue when I get home. Again, that is worth $6 a month to me.