Apparently in 2008 the market for computer music software was $425 million (https://www.quora.com/Whats-the-market-size-for-music-software-products-DAWs-plugins

Apparently in 2008 the market for computer music software was $425 million (https://www.quora.com/Whats-the-market-size-for-music-software-products-DAWs-plugins-virtual-instruments-loop-libraries-etc); https://www.quora.com/Whats-the-market-size-for-music-softwa... I can't Google anything more recent but I would say that, while not pure consumer before, it's not completely niche. Also, one of the advantages of developing pro art products is that they can be siphoned into consumer products or fun "freebies". The audio engine in Logic Pro for instance is the same as what is used in Garageband. With everyone taking photos and video on their phones these days there's probably even more opportunity in those areas.