Not sure of AW's attitude to duplicate service seekers profiles but i don.t think AW particaularly care if service seekers have aliases.
I have had the same single AW profile for about 8 or 9 years but am shown as having aliases - this is because i have helped 2 girls set up or add info onto their AW accounts, and i did this by using my PC from my home IP address, but using their AW account and their email address.
So AW has picked it up from my IP address i think rather than from cookies as i delete them regularly. The only potential downside to me i think is that if i try to book a girl that i haven.t seen before, she might be cautious of me because of this - but i explain why in my profile data and i have over 50 positive feedbacks and therefore it has not been a problem to me.