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Their Terms of Service allows up to 5 accounts per IP. I'm running four right now and have received over $240 worth of MSP since April. --- . I'M RUNNIN' THIS MONKEY FARM NOW, FRANKENSTEIN!!! - Capt. Rhodes, Day of the Dead (1985)
You don't "link" any Bing accounts to your gamertag, you just use the points from those accounts on your gamertag.
There is a point limit on the number of free points any gamertag can use though, can't remember what it is right now but it's lower than it used to be. --- "Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety." Ben Franklin