Let no one understate the value of unofficial trainers. With just official 10 trainers, it can get a bit thin at times. I spend at least three evenings a week in the TA and try to get some time during the weekend. That does not include DA time.
TA coverage: I may log 12 hours a week training. Now, if every Trainer logs 12 hours, that adds up a total of 120 hours. Frequently, there are two trainers online at a time, so lets throw out 30 hours leaving 90 hours of TA coverage. However, some trainers don't get close to 12 hours a week. So, lets revise that number down by another 20 hours. So, let's say there is 70 hours of Trainer coverage per week. That leaves 98 hours when there are no Trainers in the TA.
Here's another factor. When working with brand-new players who need to be walked through set-up and basic flying, the Trainer can only work effectively with one person at a time. It seems that there is always one person in the TA who needs that level of assistance.
Contributions by players are not just helpful, they are necessary and greatly appreciated by everyone.
My regards,
Widewing