That is a particularly nice perk, but if it goes unnoticed, that gives even less incentive for folks to use it.
There should be an edit note in the Trainer for AutoTraining, stating that the gains may end up being a tad more effective in comparison.
Also, if not a price adjustment, why not a tweak that may make it worth it for everything? Perhaps a bonus % scaling of training or something, like the X runs for the 24 hour period, but say the Auto Trainer is nice enough to also give 5% or 10% more runs for that session. In the case of pets beyond a certain tier, why not a doubler for their single session? I mean, it would be a rather lovely perk to have when a Premium Currency is involved.
I use it when I will be out ALL day and most of the night. comes in handy for vacations and such!

I use it on new pets and I don't mind at all paying the 25 csc. I remember when there was no BQ, no auto trainer and not even an alert for when you pet was done with a training session. I think this is a super easy and quick way to train pets up to a certain spot. People can train at least twice as fast if not more, so it is well worth the 25 csc, If people don;t want to spend it, then they train the old fashion way. Well sort of, there is still BQ's that speed the training time a great deal.
I'm using autotraining on my 20th and 21st pets right now. They were both started earlier this year. They are currently t6 and t7 but they both get 9 training sessions per day. I'll stop autotraining them when they get down to 5 or 6 training sessions per day. To me it is well worth the cost for the first 5-6 months with a new pet!
Love it and use it on all my pets starting out. I tend to go higher than most people for when I stop using it. I only stop when it's close to the number of courses I can flip manually in a day, give or take a class or two.
I currently use it on three pets. Now that it's confirmed that you are more likely to get two or three stats I may go back up to five.
I use it sometimes on my one battle pet, who very very slowly just crept up to T4 during this year's gelatin war. I don't always think the 25CSC is worth it, if only because the gift of fashions past chance box that I'm addicted to is 50csc and it's easy for me to think, well 2 of those autotrains coulda been a retired vanity item- but I cannot deny it is useful to train, especially when it's soooo slow otherwise.