hello mate..dont worry about the niche, concentrate on your website promotion to get visitors. any niche can get visitors and they will keep comming back if you got original content and usefull content in your website..do SEO to gain visitors and organic visitors from search engines..
anything funny ahs a lot of traffic so you can target that one. But the most important thing is how the traffic will convert. You may 5000 but it only make s few cents. So look for something that is more targeted and high converting. JulieV