I visit mine everyday. No handshakes in my krustyland but some in my Springfield. I don't think they show up for some in Krustyland. This has been mentioned on other websites I visit. I wouldn't delete anyone until we know for sure. Maybe a better use of this thread is for those who have neighbors on the board is, do you see my handshakes? That way you'll know if your game is recording those handshakes.
Also some players are already leveled up and have all the land with plenty of money. So I don't expect them to visit my Springfield everyday. Maybe they might visit Krustyland because everyone can use tickets. To me, neighbors are a way for you yourself to earn a little extra money from visiting a neighbor's town. I always visit my below level 32 friends every 24 hours because I want to help them help level up no matter what (even if there wasn't tickets to collect from neighbors.)