If you already use another service like AwardWallet to manage your balances, re-adding them to MileWise can be a bit of a chore -- definitely something we've thought about.
The good thing is you can use the search functionality without necessarily adding all your programs -- you'll still be able to see available inventory across programs, fees / earned miles, etc -- we just won't be able to do great recommendations for you.
Then later you can add your programs when you're comfortable, or as we release features to make it easier (like just forwarding your monthly program statements to a special email address instead of entering username/pass..)