Headscratchers / What's New, Scooby-Doo?

• The Roller Ghoster episode said that the rides weren’t sabotaged but gimmicked with the rides looking broken but completely safe. How does this make sense as I am sure a ride going off the rails and almost to the water is certainly dangerous and not safe.
• "Fright House of a Light House": How long was the culprit intending to keep driving other businesses under? Given what Uncle Karl said about the town depending on the harbor, if they'd kept it up for long enough, they'd eventually destroy the town and lose all their customers from there anyway.
• In "Gentlemen, Start Your Monsters", Jimmy is portrayed as somewhat sympathetic because all they want is to prove themselves despite being underage. If that were so, however, why would Cindy need to sabotage the drivers? Why couldn't they just use the remote control driver to compete normally?