Cool idea. I like it, and can see myself using it at some point rather than signing up manually. As far as price is concerned id say $9.95 would make sense for me considering the price of a domain name (for some reason im comparing the value of a good .com domain to 10 os so related social media usernames). Maybe $14.95 at a push.
Although that seems fair, people will be thinking emotionally rather than rationally valuing how much my time would be worth and how much the service saves. Perhaps split test a few prices and see which would result in the highest revenue (optimize: price*conversion rate). If you know about price elasticity from economics youll know what i mean.
Youd have to factor in that it isnt really between saving someone the time of filling in 50 forms or when perhaps they only realy care about using 10 or so of the social media sites (facebook, twitter, youtube + few others).
Also a data-entry freelancer could do a similar job for less when you begin approaching $15-20, but then again, it really takes away the hastle involved.