Silly me, I thought StumbleUpon had banned me. Well, they banned me from the free service, but are more than willing to accept my money for advertising:

Dear StumbleUpon Advertiser-

With marketing budgets shrinking and the need to stretch your advertising dollar greater than ever, there’s never been a better time to try StumbleUpon Advertising again. Unlike traditional online advertising, with StumbleUpon Advertising we drive targeted traffic directly to your site. You pay only when people actually visit your site.

More Reasons to Start a New Campaign

More traffic than ever: The StumbleUpon community continues to grow—Stumbling over 4 billion times in 2008 and actively viewing Websites—including yours!
Improved Advertiser Resources: New detailed information on how to use StumbleUpon to drive paid and organic traffic to your site, including a Top 5 tips for Advertising on StumbleUpon.
More Advertising enhancements coming later this spring: Increased targeting capabilities, enhanced reporting and even more control in driving a targeted, pre-qualified audience to your Website.

Watch a brief StumbleUpon Advertising Demo

Stay on top of SU Advertising Updates and Announcements with the Advertiser Blog

Thank you for advertising with StumbleUpon. We hope you’ll give StumbleUpon Advertising another try and that you find it to be an effective and affordable source of new traffic to your Website in 2009.

Thanks,
The StumbleUpon Advertising Team

PS: We’d love to hear your feedback. If you’d like to share feedback with us directly about your experience using StumbleUpon Advertising, please email us: advertisers@stumbleupon.com.

It is odd that I was a StumbleUpon advertiser a couple of times, then the account I had with StumbleUpon was banned, then less than 6 days later StumbleUpon advertising started to bug me with emails every couple of days. Is StumbleUpon hurting for money?