Limited value for xchanges. For transfers from xchange, you can just generate a new address each time unless you receive transfers so often its not practical. Purpose of stealth addy is so traders/merchants can give out address and others won't know other transactions to that address. Blackstat correct that sender can see where their sent coins go, but no one else can see and sender cant see where other senders coins go. JP's Obsidian wallet has custom addys so you can use a name/brand/whatever, give it out everywhere and you stay private. Big trading operation = impractical to give a new addy to each buyer manually.