I am a little confused, are you talking about selling traffic of SEO services? Seems like you are mixing those two up.
You mention that you have between 5-600K traffic, is that per day? And it's also a huge gap.
There are many MANY traffic brokers around these days, most have millions of daily visits for sale and some have over 30K publishers in their system (like
PlugRush) - ExoClick claims to have 3.2 billion daily impressions. So.. well ;)
I'd sell it to PlugRush unless you want to build your own system, in that case, well be prepared for an uphill battle - but it is never to late
