I think +1000 users is a pretty nice number to find your business model, in your case, what are your customer acquisition cost and your churn rate? is your model sustainable?
I really should dig into my analytics to determine the churn rate.
My acquisition costs are basically free for a base line of about 10 signups per day plus sporadic increases from blog or forum posts. But this is nowhere near enough to generate significant revenue.
In future I'll experiment again with advertising and with optimising my site for revenue to know whether I can make advertising profitable.
If your numbers are fine...so go ahead!