Yes, multiple accounts (for one person) is against the rules.
from the Terms & Conditions...
Each user participating at WORLD GOLF TOUR (WGT) may have only one
player account. If you wish to create a new player account, please
contact us at support@worldgolftour.com. If World Golf Tour determines
that you have more than one account, all accounts created subsequent to
the first account may be automatically terminated without notice.
Continued violation of the Terms & Conditions, including the
creation of more than one player account, may result in the termination
of all of your player accounts.
*edit* ninja'd by Snaike :o