I've included Fiverr as a good benchmark of what they offer versus my own idea. Fiverr is a pretty reliable website if you're simply wanting some online services like graphic design. The amount of categories they can offer is limited by the way it is simply designed. It's designed for not much more than graphic design, copywriting or video editing. The pricing structure is pretty narrow and the fees are exorbitant. You're looking at a 20% fee ($1) on a $5 purchase and that's just as the buyer. The seller also has to pay a fee as well. Why should they be getting $2 in fees from just a $5 sale?
I am big fan of Fiverr since it started its successful ascent in the world of freelancing and I am still a member of the site up to now though I am not active anymore. Fiverr is a great trailblazer a great pioneer specially in the aspect of reaching more people and lowering the price category. However, Fiverr is not the be-all of cheap freelancing as you are pointing out as there are still many kinds of services that Fiverr is not into...and this is where other players can come in. I love your idea of expanding the coverage area and make the fees aligned with the industry. I am wishing you all the luck and always make your project viable so it can last.