Considering most companies are shitty and would fuck you in a heartbeat, how shitty do you feel for taking a job, starting, get trained just to hold out for another position that’s taking a while to get back to you?

Context: got an offer letter for a decent sys admin job but pay is meh and pretty sure they won’t accept my counter offer. (If they do I will accept and start). There is another position I am waiting on that I have everything done except the manager interview who decides if I come on or not and it pays really well and I’m confident I’m one of the best if not only qualified person for the job. Would it be a dick move of me to take the first job while I wait for the other one? This is all considering if they accept my counter offer. They did ignore my original request and offered me $4000 less so I’m not sure whether or not this is something I should take into consideration.