A friend's maintenance-deprived Sceadu had a Jesus bolt failure after many, many, many flights (thousands?). It met its end on the concrete.

My own Evo 50 once snapped a one-way bearing during a rolling circle and the dampeners are now showing signs of wear, but the heli has otherwise been trouble-free. Considering what it's flown through, it's a great machine imho.

Some areas don't need lubrication while others do. I've personally never lubricated the bearings on my Evo and so far so good. As for the gears and ball links, keep them free of lubricant. They don't need it and could be harmed by it because some lubricants weaken plastic and/or attract abrasive dust. You can oil the mainshaft (swash & washout), tail pitch slider and one-way bearing. The tail shaft tends to sling off the oil, so I reapply it at the beginning of each flying day. While grease would hang on better, it would also slow down the tail pitch servo so don't use it there.