Just google, there's massive amounts of industry data. One term is "insertion cycle", another is "loss of force". A typical soldered PCB connection will always last longer than a comparable mechanical one. (comparing cheap to cheap and exotic to exotic, so no fair comparing a corroded solder joint in a throwaway greeting card to the backplanes in an FA/18).
The term "Mechanical Durability (min.): 30 cycles" means that this socket is only guaranteed for 30 insertion/removal cycles and they don't specify a lifetime. Is that lower than you were expecting? Making connectors is hard!
I don't know of a good overview but here's a specific example: http://www.mouser.com/pdfdocs/Molexlga2011brochure-3.pdf
The term "Mechanical Durability (min.): 30 cycles" means that this socket is only guaranteed for 30 insertion/removal cycles and they don't specify a lifetime. Is that lower than you were expecting? Making connectors is hard!
Amusing that my comment is factual and at -1.