It's apparently illegal. Go to Terms of Use as you sign up for a new account and read it.
"
Non-commercial Use by Members. The MySpace Services are for the personal use of Members only and may not be used in connection with any commercial endeavors except those that are specifically endorsed or approved by MySpace.com. ....Commercial advertisements, affiliate links, and other forms of solicitation may be removed from Member profiles without notice and may result in termination of Membership privileges. Appropriate legal action will be taken for any illegal or unauthorized use of the MySpace Services.
Content/Activity Prohibited. The following is a partial list of the kind of Content that is illegal or prohibited to post on or through the MySpace Services. MySpace.com reserves the right to investigate and take appropriate legal action against anyone who, in MySpace.com's sole discretion, violates this provision, including without limitation, removing the offending communication from the MySpace Services and terminating the Membership of such violators. Prohibited Content includes, but is not limited to Content that, in the sole discretion of MySpace.com:
- solicits personal information from anyone under 18;
- provides any telephone numbers, street addresses, last names, URLs or email addresses;
- involves commercial activities and/or sales without our prior written consent such as contests, sweepstakes, barter, advertising, or pyramid schemes;
The following is a partial list of the kind of activity that is illegal or prohibited on the MySpace Website and through your use of the MySpace Services. MySpace.com reserves the right to investigate and take appropriate legal action against anyone who, in MySpace.com's sole discretion, violates this provision, including without limitation, reporting you to law enforcement authorities. Prohibited activity includes, but is not limited to:
advertising to, or solicitation of, any Member to buy or sell any products or services through the MySpace Services
- displaying an advertisement on your profile, or accepting payment or anything of value from a third person in exchange for your performing any commercial activity on or through the MySpace Services on behalf of that person, such as placing commercial content on your profile, posting blogs or bulletins with a commercial purpose, selecting a profile with a commercial purpose as one of your "Top 8" friends, or sending private messages with a commercial purpose; or ..."
and there might be more. Sorry. I'd like it to be true.