At 2000 uniques a year your site is in START-UP.
You can reasonably expect far more growth if you are actively promotiing your site. 20,000 – 50,000 would not be a surprise to me.
The sale of the banner is an expensive buy for the purchaser right now (just 1,000 uniques per year?!!) but could prove a bargain if you succeed.
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You should celebrate your initial success – but also plan for continued exponential growth.
:happydanc