I've seen this many times, a couple of occasions they did not turn out well (I'll skip talking about those ones for now). Some of the most extreme cases that I've seen were actually the guides.
On Kilimanjaro I saw people literally being carried, pushed and pulled up to the summit by their guides and porters. We saw them as they passed our high camp later, almost being dragged by their guides down the mountain because they were so exhausted and/or sick.
On Aconcagua this year, we saw one individual loose his balance and fall (25-30º slope) about 20 feet off the trail, and unable to climb back up to the trail himself. I helped with this effort and kept him on the trail as his guides talked in a different language, He almost fell off the trail again from a sitting position. After heading away to complete my own summit push I saw his guides short-roping him up.
I think these all come in the name of the guides summit success rate, which later they use as advertising, more than the safety and enjoyment of the climbers.
On the contrary though I have met several international guides who do their best to make sure that their clients enjoy the trip safely.
I'm lucky enough that I've been able to tell myself that the mountain will always be there next season... except for Mt. St. Helens that is
