When all we had was vinyl some of that was to be expected at the level of equipment I had available so I never thought anything of it. (Would cleaning help that? I don't know.) My point in all this is that if that is not acceptable I would be reticent to buy more used vinyl at those prices as it seems like a gamble.
@n80,
Typically a thorough cleaning, specifically inside the grooves, removes noise plus many of the clicks and pops. Since these are used records with unknown history, results will always vary. But cleaning is a must and will make a record sound better (unless it's damaged).
Years ago I also thought that clicks and pops were part of the vinyl experience. I was led to believe all I needed was my trusty Discwasher brush.