Well, by not releasing digitally you are closing off your market.
I don`t DJ any more, so I don`t buy vinyl.
I buy all my music digitally. If there is osmething I like that is vinyl only, I will download an illegal rip.
So the artist has lost my sale.
You can`t stop piracy, but if you make your music available on all formats, those that love the music will pay for it.
Vinyl usually gets ripped the same day as release, so not selling digital versions of your vinyl does absolutely nothing to stop piracy.
Vinyl is very expensive and most people these days don`t want to pay £8 for an ep of which they may only like 1 track.
Sad state of affairs, but reality is reality. Embrace the future or get left behind in the ditch is what I say.