I can't see the demand for a new label TBH.
The big boys are there because of their advertising clout. The new artists release their own work directly or through aggregators.
Bands that might want your service will be the ones that can't be bothered to do the aggregator leg work themselves - you might be better off doing that as a professional service with your product being doing the work for them, rather than you being an actual label.
Anyone can get on iTunes / Amazon etc now by using the right aggregator, but iTunes and Amazon still take a chunky percentage - I can't see a new band wanting to pay you a percentage as well.
If I couldn't be bothered to do it myself, or didn't have time to learn the process I would certainly prefer to pay a flat fee where I give you my fully recorded product and you deal with the bar-coding & registrations and getting it to an aggregator, and then your task is over.