There is also the prospect of one falling down in a wind and causing damage. In the case of most eucalyptus, this is a long way. As soon as we moved into our house we took down a young tree growing no more than a metre from the wall of an extension. It had been cut several times, but their growth rate is fast and the tree was already higher than the house and interfering with overhead cables. But there are other ways to enjoy eucalyptus than letting them grow into mature trees.
Young plants are easily to raise from seed and, with their juvenile foliage, are most attractive.
Try planting them out as subtropical bedding, but scrap them when they get bigger and grow more from seed. Or you can plant, then 'stool' by cutting the stem close to the ground. Several new stems arise and in turn can all be cut back, just as hard, in the spring of the following year. This way, the eucalyptus remains shrubby. I've cut into the stem, and the stem doesn't have any real staining in it, which rules out a spider mite infestation.