I tend not to continually bait a spot as like you say there is a chance someone might go in there. Though when I have done this, it is in the winter months when the lake is much quieter and the few of you left fishing tend to come to an agreement, well that's what has happened on the lakes I fished.
That Is why I've only gone on baiting teams with people I trust 100%. We work for each other. My first year on my current lake, I fished it and baited it whilst my other mate fished out his last year on his lake. He still put in over 150kg that year, most of which he gave to me to put in. I was top rod by a mile. The following winter I was going down mid week putting in 5kg a week with my mate coming down on the weekends to fish, he rinsed the lake, catching more fish that winter than most caught in a season. And the good thing is no one knows about his catches to this day. I was going down in the middle of the night to do pics for him.
When done right and with people you trust , pre-baiting can make your fishing very easy. As long as you fish properly yourself.