Poolrooms are businesses, man!
While what you're saying would be lovely in a utopian world, it just isn't practical. We've got to remember that these pool tables take up a lot of space, every square foot of which must be paid for! I believe that the absolute minimum space necessary for a 9 foot table is about 14' by 18', some 252 square feet. If the room owner isn't going to get any revenue at all from that square footage, then simple business sense dictates that he's going to have do something else with it. Of course, we haven't even begun to factor in the cost of the pool table, balls, house sticks, new cloth and rails, the cost of the electricity to light the table, the cost of labor to maintain and repair the tables, etc.
Let's put it another way. Based on my best recollection, the modern pool hall, which offers food beverages, instruction and pro shop services, gets somewhere around 33% of its revenues from table time. You show me a business that can afford to give up 33% percent of its revenues and I'll show you a front for some other activity.
"We must never fail to make the distinction between reality and the ideas we have in our heads" --Amilcar Cabral