If you see more and more of them in your kitchen, you most likely are not cleaning it properly after every meal.
Sure, if your kitchen was on the moon, you wouldn't have a bug issue. That would still be dirty.
I had neighbors with filthy apartments who thought the solution is routine spraying. Every time, the roaches would take shelter in mine through unknown passages.
More than what? If my neighbour has 2000 roaches in his apartment. Then it would not be strange 10 walks into mine. And if they do they of course gonna hang out were they find the most amount of food (even if you clean odds are there is going to be more residue etc in kitchen vs bedroom)