We have two Eucharist Adorations in my town, one is perpetual adoration, which is suggested we have 2 adorers for each hour, most of the time there is only one, i prefer just one per hour but what ever that is just me....
then there was a problem of homeless drifting in asking for money, so that freaked everyone out and then a security lock n code was installed on the door, well guess what, no one can remember the code half the time or figure out which way to turn the knob, so they pound on the door till someone opens.
then the other location is at our cathedral, which offers adoration either once a week on Fridays for day time hours.
I would imagine the big problem is lay people not being able to commit to scheduled hours, then substitutes not being available , location and security are another factor .
as to why a catholic priest would be annoyed at the suggestion or request is indeed odd and i hope the O.P can clarify later.