So, if the snipe guard eventually ends, how does this not prevent sniping? Someone can just stay on that extra hour to snipe you like they would without a snipe guard.
Regarding your seller: Getting more money isn't a bad thing, but if the seller wants an expected price, then they put the SB as the lowest price they'll take. Common knowledge to do that if you're an avid auctioneer. People also shouldn't be restricted in auctions if they need the money fast. Using the threads to buy and sell can be used to easily avoid sniping. Double-edged sword, right there.
Regarding your buyer: If the buyer obviously really wants an item, they'll stalk until the very end, and if they lose they get their hopes shot down. Auctions aren't about hopes though, it's about a way to buy an sell at however high buyers are willing to go and to sell at however low sellers are willing to go. It's unfair for the buyer to have to back down because they have to wait constantly because of a snipe guard.
Quite frankly, I don't care if a snipe guard is put up or not. If I want an item, I'll keep posting last minute to put off potential buyers, as you said would apparently do.
Lastly, snipe guards won't make auctions easier. If people are willing to wait out the snipe, then you'll still end up without the item, just have to wait longer than you would if there was no snipe guard.
I also think your points contradict the reasons for your snipe guard, since they don't really help the situation other than drag out the inevitable.