i think the CD per unit would have to be a fair bit cheaper than vinyl, that's kind of the whole point is it not? just slightly cheaper wont cut it i seriously think, because half the problem with people not buying vinyl anymore is because it is still relatively expensive, and outrageously expensive in places. Unfortunately these days paying £7.50, £8 etc for a record puts alot of people off because they can buy it alot cheaper digitally and with alot less hassle usually. I might be wrong but i actually think alot of people are using laptops than actually just using CDJ's at the moment and digital downloads would be a more viable option than CD, certainly, IMO of course.