Genghis.
Strongly object to your comment about gliders being less well maintained than powered a/c. I work on the licensed side (I do not have a license),and play with gliders. PFA aircraft and microlights do not necessarily use 'certified' parts. Are they dangerous too?
Most glider pilots will sense 'something wrong' with the aircraft long before a power pilot would. With all that noise and vibration he wouldn't notice the tail fall off until the stick went slack. Most glider owners are seeking perfection in all directions with their aircraft and I suspect you will find the MAJORITY of gliders better maintained than the powered sort. I also suspect that the average glider pilot will be much more familiar with the workings of his machine than the power pilot.
Mike W