No, it certainly is not normal in Florida, and as others have stated, apparently not normal in Ohio.
But shouldn't it be?
How did the expectation become established that an agent would invest the time and resources to tour a citizen around the community - FREE?
Many business oriented agents DO require a prospective buyer to sign a exclusive buyers agreement.
Would you do that?
A $275 fee would establish a commitment on your part AND if credited to you when you purchase should result in no cost to you. Would that not be acceptable?
It appears one agent in a brokerage in Ohio is conducting their enterprise as a real business rather than a hobby. Only in real estate is a citizen permitted to use time and resources of a real estate professional with an expectation it is FREE. Perhaps this practice of 'giving away' our help should end. But, that would take courage.