I have a site like this as well and it makes about a paltry $40k on a good year. I mostly got lucky because I had some niche domain knowledge for a specific industry that was lacking a web product. I wasted money trying to grow it for some time but I've come to accept even at it's full potential it would probably only make maybe double of what it does now at max. I hope someday though i'll stumble across a $600k a year opportunity.