It's a special niche where a certain demand for keywords etc. is nearly unpredictable as it's a very own culture with its very own language. Looking at sales with the exact term as "meme.ly" going for 142 $ or and even "meme.us" for just 265 $ I kinda have to go with Arpit here. Admitting you have a very good combination I think it will be tough to sell as long as you don't build your own site on it. Best of luck tho, try to reach out to the big established sites like knowyourmeme and get some feedback. Cheers